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Lleyn Peninsula, Gwynedd, Wales, UK i
Regional Level Types
Lleyn Peninsula Peninsula
Gwynedd County
Wales Country
UK Country

Regional Level Types
Lleyn Peninsula	Peninsula
Gwynedd	County
Wales	Country
UK	Country

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Predictive Mineralogy Search Google Type Localities in Region

Paracelsian

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

Paracelsian

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

Celsian

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

Paracelsian

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

Paracelsian

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

Celsian

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

Paracelsian

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

Paracelsian

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

Type:

Peninsula

Age:

458 to 448 Ma

Geologic Time:

Late/Upper Ordovician

Largest Settlements:

Place	Population
Pwllheli	4,076 (2017)
Criccieth	1,753 (2017)
Nefyn	1,373 (2017)
Morfa Nefyn	857 (2017)
Abersoch	783 (2017)
Chwilog	640 (2017)

Mindat Locality ID:

19597

Long-form identifier:

mindat:1:2:19597:6

GUID (UUID V4):

Other/historical names associated with this locality:

Caernarvonshire

The Lleyn Peninsula, an undulating spur reaching out from the mountains of Snowdonia, is the most westerly point of Gwynedd. Twenty five miles long, it averages eight miles in width, and separates Caernarfon and Cardigan Bays. It is bordered to the east by the A487 Caernarfon-Porthmadog road.

At various times manganese, iron and lead-copper mines have operated on the Lleyn.

There are 16 granitic intrusions and contemporary intermediate to rhyolitic volcanic rocks, some of which are peralkaline (Croudace 1982; Leat & Thorpe 1986). All the rocks have undergone mild metamorphism.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.

ⓘ Iron

ⓘ Manganese

Mineral List

Mineral list contains entries from the region specified including sub-localities

ⓘ 'Apophyllite Group'

ⓘ Atacamite

ⓘ Axinite-(Fe)

ⓘ Banalsite (TL)

ⓘ Bannisterite (TL)

ⓘ 'Hornblende Root Name Group'

ⓘ Microcline
var. Hyalophane

ⓘ Pennantite (TL)

63 valid minerals. 4 (TL) - type locality of valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Rock list contains entries from the region specified including sub-localities

Select Rock List Type

Alphabetical List Tree Diagram

ⓘ Granite

ⓘ 'Microgranite'

ⓘ 'Peralkaline rhyolite'

Detailed Mineral List:

ⓘ 'Alkali amphibole'

References:

Fitch, F. J. (1967). Ignimbrite volcanism in north Wales. Bulletin Volcanologique, 30(1), 199-219. doi.org/10.1007/BF02597669

Croudace, I. W. (1982). The geochemistry and petrogenesis of the lower Paleozoic granitoids of the Lleyn Peninsula, North Wales. Geochimica et Cosmochimica Acta, 46(4), 609-621. doi.org/10.1016/0016-7037(82)90162-4

Leat, P. T., & Thorpe, R. S. (1986). Geochemistry of an ordovician basalt‐trachybasalt‐subalkaline/peralkaline rhyolite association from the Lleyn Peninsula, North Wales, UK. Geological Journal, 21(1), 29-43. doi.org/10.1002/gj.3350210103

✪ Alleghanyite

Formula: Mn²⁺₅(SiO₄)₂(OH)₂

Locality: Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

Habit: blade-like

Colour: clove-brown

Description: Alleghanyite was found as individual crystals or, more commonly, composite crystals with tephroite. The composite alleghanyite/tephroite crystals are up to 2 cm in length and vary in thickness from 2 mm to microscopic size. The alleghanyite contains up to 4.8 wt% Ti.

References:

Bevins, Richard E. (1994) A Mineralogy of Wales - Geological Series No. 16. National Museum of Wales. 146pp.

Liferovich, R. P., Mitchell, R. H., Zozulya, D. R., Shpachenko, A. K. (2006) Paragenesis and composition of banalsite, stronalsite, and their solid solution in nepheline syenite and ultramafic alkaline rocks. The Canadian Mineralogist, 44 (4) 929-942 doi:10.2113/gscanmin.44.4.929

ⓘ Analcime

Formula: Na(AlSi₂O₆) · H₂O

Localities:

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK
Gimlet Quarry, Pwllheli, Gwynedd, Wales, UK

ⓘ Anatase

Formula: TiO₂

Locality: Trwyn-y-tal, Llanaelhaearn, Gwynedd, Wales, UK

References:

Render, Paul (n.d.) Paul Render Collection.

ⓘ Andradite

Formula: Ca₃Fe³⁺₂(SiO₄)₃

Locality: Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

References:

ⓘ Anglesite

Formula: PbSO₄

Locality: Penrhyn Du Mine, Abersoch, Llanengan, Gwynedd, Wales, UK

References:

Day, Harry (1999) BMS Database, British Micromount Society.

ⓘ 'Apatite'

Formula: Ca₅(PO₄)₃(Cl/F/OH)

Locality: Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

References:

ⓘ 'Apophyllite Group'

Formula: AB₄[Si₈O₂₂]X · 8H₂O

Locality: Gimlet Quarry, Pwllheli, Gwynedd, Wales, UK

References:

National Museum of Wales collection

ⓘ Atacamite

Formula: Cu₂(OH)₃Cl

Locality: Abersoch beach, Abersoch, Llanengan, Gwynedd, Wales, UK

References:

Dossett, I. , Green, D.I. (1998) Atacamite, botallackite and cumengeite from Abersoch, Gwynedd, Wales. Journal of the Russell Society, 7 (1) 37-38

ⓘ Axinite-(Fe)

Formula: Ca₂Fe²⁺Al₂BSi₄O₁₅OH

Locality: Carreg Ddu, Porth Dinllaen, Nefyn, Gwynedd, Wales, UK

References:

National Museum of Wales specimens

ⓘ Banalsite (TL)

Formula: Na₂BaAl₄Si₄O₁₆

Type Locality:

References:

Smith, W. Campbell; Bannister, F. A.; Hey, Max H. (1944) Banalsite, a new barium-felspar from Wales. Mineralogical Magazine and Journal of the Mineralogical Society, 27 (186). 33-47 doi:10.1180/minmag.1944.027.186.01

Cotterell, T. F. (2008) The First British Occurrence of Feitknechtite at Benallt Manganese Mine, Rhiw, Pen Llyn, Gwynedd, Wales. Uk Journal of Mines and Minerals 29, 47-48

ⓘ Bannisterite (TL)

Formula: (Ca,K,Na)(Mn²⁺,Fe²⁺)₁₀(Si,Al)₁₆O₃₈(OH)₈ · nH₂O

Type Locality:

References:

Smith, Marie Lindberg, Frondel, Clifford (1968) The related layered minerals ganophyllite, bannisterite, and stilpnomelane. Mineralogical Magazine and Journal of the Mineralogical Society, 36 (283) 893-913 doi:10.1180/minmag.1968.283.036.01

Embrey, Peter G. (1978) Fourth supplementary list of British minerals. Mineralogical Magazine, 42 (322) 169-177 doi:10.1180/minmag.1978.042.322.01

Cotterell, T. F. (2008) The First British Occurrence of Feitknechtite at Benallt Manganese Mine, Rhiw, Pen Llyn, Gwynedd, Wales. Uk Journal of Mines and Minerals 29, 47-48

ⓘ Baryte

Formula: BaSO₄

Localities:

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK
Penrhyn Du Mine, Abersoch, Llanengan, Gwynedd, Wales, UK
Port Nigel Mine, Llanengan, Llanengan, Gwynedd, Wales, UK
Assheton Mine, Abersoch, Llanengan, Gwynedd, Wales, UK

ⓘ 'Biotite'

Formula: K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂

Locality: Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

References:

ⓘ Birnessite

Formula: (Na,Ca)_0.5(Mn⁴⁺,Mn³⁺)₂O₄ · 1.5H₂O

Locality: Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

ⓘ Bixbyite-(Mn)

Formula: Mn³⁺₂O₃

Locality: Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

ⓘ Bornite

Formula: Cu₅FeS₄

Locality: Abersoch beach, Abersoch, Llanengan, Gwynedd, Wales, UK

References:

Dossett, I. , Green, D.I. (1998) Atacamite, botallackite and cumengeite from Abersoch, Gwynedd, Wales. Journal of the Russell Society, 7 (1) 37-38

ⓘ Botallackite

Formula: Cu₂(OH)₃Cl

Locality: Abersoch beach, Abersoch, Llanengan, Gwynedd, Wales, UK

References:

Dossett, I. , Green, D.I. (1998) Atacamite, botallackite and cumengeite from Abersoch, Gwynedd, Wales. Journal of the Russell Society, 7 (1) 37-38

ⓘ Brookite

Formula: TiO₂

Locality: Gimlet Quarry, Pwllheli, Gwynedd, Wales, UK

References:

National Museum of Wales collection

ⓘ Calcite

Formula: CaCO₃

Localities:

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK
Nant Mine, Nant-y-Gadwen, Aberdaron, Gwynedd, Wales, UK
Gimlet Quarry, Pwllheli, Gwynedd, Wales, UK

ⓘ Caryopilite

Formula: Mn²⁺₃Si₂O₅(OH)₄

Localities:

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK
Nant Mine, Nant-y-Gadwen, Aberdaron, Gwynedd, Wales, UK

ⓘ Celsian

Formula: Ba(Al₂Si₂O₈)

Localities:

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK
Nant Mine, Nant-y-Gadwen, Aberdaron, Gwynedd, Wales, UK

ⓘ Cerussite

Formula: PbCO₃

Locality: Penrhyn Du Mine, Abersoch, Llanengan, Gwynedd, Wales, UK

References:

Day, Harry (1999) BMS Database, British Micromount Society.

ⓘ Chalcopyrite

Formula: CuFeS₂

Locality: Abersoch beach, Abersoch, Llanengan, Gwynedd, Wales, UK

References:

Dossett, I. , Green, D.I. (1998) Atacamite, botallackite and cumengeite from Abersoch, Gwynedd, Wales. Journal of the Russell Society, 7 (1) 37-38

ⓘ 'Chlorite Group'

References:

Fitch, F. J. (1967). Ignimbrite volcanism in north Wales. Bulletin Volcanologique, 30(1), 199-219. doi.org/10.1007/BF02597669

ⓘ Cotunnite

Formula: PbCl₂

Locality: Penrhyn Du Mine, Abersoch, Llanengan, Gwynedd, Wales, UK

References:

Hubbard, N., Green, D.I. (2005) Cotunnite from Penrhyn Du Mine, Gwynedd, Wales. Journal of the Russell Society, 8 (2) 106-107

ⓘ Cumengeite

Formula: Pb₂₁Cu₂₀Cl₄₂(OH)₄₀ · 6H₂O

Locality: Abersoch beach, Abersoch, Llanengan, Gwynedd, Wales, UK

References:

Dossett, I. , Green, D.I. (1998) Atacamite, botallackite and cumengeite from Abersoch, Gwynedd, Wales. Journal of the Russell Society, 7 (1) 37-38

ⓘ Cymrite (TL)

Formula: BaAl₂Si₂(O,OH)₈ · H₂O

Type Locality:

Habit: masses to 2mm

References:

Smith, W. Campbell, Bannister, F. A., Hey, Max H. (1949) Cymrite, a new barium mineral from the Benallt manganese mine, Rhiw, Carnarvonshire. Mineralogical Magazine and Journal of the Mineralogical Society, 28 (206) 676-681 doi:10.1180/minmag.1949.28.206.02

Cotterell, T. F. (2008) The First British Occurrence of Feitknechtite at Benallt Manganese Mine, Rhiw, Pen Llyn, Gwynedd, Wales. Uk Journal of Mines and Minerals 29, 47-48

Wolfe, M., Oddy, M., Starkey, R. (2008) Mineral News. UK Journal of Mines and Minerals 29, 4-22

ⓘ Epidote

Formula: (CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)

Locality: Carreg Ddu, Porth Dinllaen, Nefyn, Gwynedd, Wales, UK

ⓘ Epidote-(Sr)

Formula: (CaSr)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)

Locality: Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

Colour: Crimson

Description: Analyses show that crimson needles embedded in celsian are almost exclusively epidote-(Sr)

References:

Cotterell, T., Tayler, R. (2012) Epidote-(Sr) and piemontite-(Sr): two minerals new to Britain from Benallt mine, Pen Llŷn, Gwynedd, Wales. UK Journal of Mines and Minerals 33, Rockbottom Publications. 39-42

ⓘ Feitknechtite

Formula: Mn³⁺O(OH)

Locality: Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

References:

Cotterell, T. F. (2008) The First British Occurrence of Feitknechtite at Benallt Manganese Mine, Rhiw, Pen Llyn, Gwynedd, Wales. Uk Journal of Mines and Minerals 29, 47-48

ⓘ Fluorapatite

Formula: Ca₅(PO₄)₃F

Localities:

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK
Nant Mine, Nant-y-Gadwen, Aberdaron, Gwynedd, Wales, UK

ⓘ Galena

Formula: PbS

Localities:

Penrhyn Du Mine, Abersoch, Llanengan, Gwynedd, Wales, UK
Abersoch beach, Abersoch, Llanengan, Gwynedd, Wales, UK
Port Nigel Mine, Llanengan, Llanengan, Gwynedd, Wales, UK
Llanengan, Gwynedd, Wales, UK
Assheton Mine, Abersoch, Llanengan, Gwynedd, Wales, UK

ⓘ Ganophyllite

Formula: (K,Na,Ca)₂Mn₈(Si,Al)₁₂(O,OH)₃₂ · 8H₂O

Localities:

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK
Nant Mine, Nant-y-Gadwen, Aberdaron, Gwynedd, Wales, UK

ⓘ Harmotome

Formula: Ba₂(Si₁₂Al₄)O₃₂ · 12H₂O

Locality: Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

References:

ⓘ Hausmannite

Formula: Mn²⁺Mn³⁺₂O₄

Locality: Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

References:

Cotterell, T. F. (2008) The First British Occurrence of Feitknechtite at Benallt Manganese Mine, Rhiw, Pen Llyn, Gwynedd, Wales. Uk Journal of Mines and Minerals 29, 47-48

ⓘ Hematite

Formula: Fe₂O₃

Locality: Trwyn-y-tal, Llanaelhaearn, Gwynedd, Wales, UK

References:

Render, Paul (n.d.) Paul Render Collection.

ⓘ 'Hornblende Root Name Group'

Formula: ◻Ca₂(Z²⁺₄Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂

ⓘ Jacobsite

Formula: Mn²⁺Fe³⁺₂O₄

Localities:

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK
Nant Mine, Nant-y-Gadwen, Aberdaron, Gwynedd, Wales, UK

ⓘ 'Jacobsite-Q'

Formula: Mn²⁺(Fe³⁺,Mn³⁺)₂O₄

Locality: Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

References:

Cotterell, T. F. (2008) The First British Occurrence of Feitknechtite at Benallt Manganese Mine, Rhiw, Pen Llyn, Gwynedd, Wales. Uk Journal of Mines and Minerals 29, 47-48

ⓘ 'Limonite'

Locality: Penrhyn Du Mine, Abersoch, Llanengan, Gwynedd, Wales, UK

References:

Render, Paul (n.d.) Paul Render Collection.

ⓘ Magnetite

Formula: Fe²⁺Fe³⁺₂O₄

Locality: Trwyn-y-tal, Llanaelhaearn, Gwynedd, Wales, UK

References:

Render, Paul (n.d.) Paul Render Collection.

ⓘ Manganite

Formula: Mn³⁺O(OH)

Locality: Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

ⓘ Manganosite

Formula: MnO

Locality: Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

ⓘ Microcline var. Hyalophane

Formula: (K,Ba)[Al(Si,Al)Si₂O₈]

Locality: Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

ⓘ Native Sulphur

Formula: S₈

Localities:

Penrhyn Du Mine, Abersoch, Llanengan, Gwynedd, Wales, UK
Llanengan, Gwynedd, Wales, UK

ⓘ Natrolite

Formula: Na₂Al₂Si₃O₁₀ · 2H₂O

Localities:

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK
Gimlet Quarry, Pwllheli, Gwynedd, Wales, UK

ⓘ Neotocite

Formula: (Mn,Fe)SiO₃ · H₂O (?)

Locality: Nant Mine, Nant-y-Gadwen, Aberdaron, Gwynedd, Wales, UK

Description: Massive, dark brown to black, breaking into dark olive-green to brown translucent fragments.

References:

Clark, A. M., Easton, A. J., Mount, M. (1978) A study of the neotocite group. Mineralogical Magazine, 42 (322) 279-280 doi:10.1180/minmag.1978.042.322.19

ⓘ Paracelsian

Formula: Ba(Al₂Si₂O₈)

Locality: Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

References:

Spencer, L. J. (1942) Barium-felspars (celsian and paracelsian) from Wales. Mineralogical Magazine and Journal of the Mineralogical Society, 26 (178) 231-245 doi:10.1180/minmag.1942.026.178.01

ⓘ Paragonite

Formula: NaAl₂(AlSi₃O₁₀)(OH)₂

Locality: Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

ⓘ Pectolite

Formula: NaCa₂Si₃O₈(OH)

Locality: Gimlet Quarry, Pwllheli, Gwynedd, Wales, UK

References:

National Museum of Wales collection

ⓘ Pennantite (TL)

Formula: Mn²⁺₅Al(AlSi₃O₁₀)(OH)₈

Type Locality:

References:

Campbell Smith, W., Bannister, F. A., Hey, Max H. (1946) Pennantite, a new manganese-rich chlorite from Benallt mine, Rhiw, Carnarvonshire. Mineralogical Magazine and Journal of the Mineralogical Society, 27 (194) 217-220 doi:10.1180/minmag.1946.027.194.01

Campbell, et al (1946).

Fleischer, M. (1947) New mineral names. American Mineralogist: 32: 254.

Smith, W. Campbell, Bannister, F. A. (1948) Ganophyllite from the Benallt Mine, Rhiw, Carnarvonshire. Mineralogical Magazine and Journal of the Mineralogical Society, 28 (201) 343-352 doi:10.1180/minmag.1948.028.201.04

Lee, Donald E. (1955) Occurrence of pyrophanite in Japan. American Mineralogist, 40 (1-2) 32-40

Bayliss, P. (1983). Polytypes of pennantite. Canadian Mineralogist, 21(3), 545-547.

Cotterell, T. F. (2008) The First British Occurrence of Feitknechtite at Benallt Manganese Mine, Rhiw, Pen Llyn, Gwynedd, Wales. Uk Journal of Mines and Minerals 29, 47-48

ⓘ Phosgenite

Formula: Pb₂CO₃Cl₂

Locality: Penrhyn Du Mine, Abersoch, Llanengan, Gwynedd, Wales, UK

References:

Day, Harry (1999) BMS Database, British Micromount Society.

ⓘ Piemontite

Formula: (CaCa)(AlAlMn³⁺)O[Si₂O₇][SiO₄](OH)

Locality: Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

References:

BMS Collection

ⓘ Piemontite-(Sr)

Formula: (CaSr)(AlAlMn³⁺)O[Si₂O₇][SiO₄](OH)

Locality: Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

References:

Wolfe, M., Oddy, M., Starkey, R. (2008) Mineral News. UK Journal of Mines and Minerals 29, 4-22

ⓘ Powellite

Formula: Ca(MoO₄)

Locality: Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

Description: creamy-white microcrystals

References:

Mational Museum of Wales database

ⓘ Prehnite

Formula: Ca₂Al₂Si₃O₁₀(OH)₂

Locality: Gimlet Quarry, Pwllheli, Gwynedd, Wales, UK

References:

National Museum of Wales collection

ⓘ Pyrite

Formula: FeS₂

Localities:

Penrhyn Du Mine, Abersoch, Llanengan, Gwynedd, Wales, UK
Assheton Mine, Abersoch, Llanengan, Gwynedd, Wales, UK

ⓘ Pyrochroite

Formula: Mn(OH)₂

Locality: Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

References:

R. E. Bevins (1988) Sixth Supplementary List of British Isles Minerals (Welsh). Mineralogical Magazine 52:121-124

ⓘ Pyrolusite

Formula: Mn⁴⁺O₂

Locality: Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

ⓘ Pyromorphite

Formula: Pb₅(PO₄)₃Cl

Locality: Penrhyn Du Mine, Abersoch, Llanengan, Gwynedd, Wales, UK

References:

Render, Paul (n.d.) Paul Render Collection.

ⓘ Pyrophanite

Formula: Mn²⁺TiO₃

Locality: Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

References:

Smith, W. Campbell, Claringbull, G. F. (1947) Pyrophanite from the Benallt mine, Rhiw, Carnarvonshire. Mineralogical Magazine and Journal of the Mineralogical Society, 28 (197) 108-110 doi:10.1180/minmag.1947.028.197.06

Lee, Donald E. (1955) Occurrence of pyrophanite in Japan. American Mineralogist, 40 (1-2) 32-40

ⓘ Pyroxmangite

Formula: Mn²⁺SiO₃

Locality: Nant Mine, Nant-y-Gadwen, Aberdaron, Gwynedd, Wales, UK

References:

Cotterell, T. F. (2006) Caryopilite and Pyroxmangite from Nant Mine, Nant-y-Gadwen, Llanfaelrhys, Pen Llyn, Gwynedd, Wales. Uk Journal of Mines and Minerals 27, 51-53pp.51-53

ⓘ Quartz

Formula: SiO₂

Localities: Reported from at least 7 localities in this region.

ⓘ Quartz var. Chalcedony

Formula: SiO₂

Locality: Pen-y-chain, Llannor, Gwynedd, Wales, UK

References:

Render, Paul (n.d.) Paul Render Collection.

ⓘ Rhodochrosite

Formula: MnCO₃

Localities:

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK
Nant Mine, Nant-y-Gadwen, Aberdaron, Gwynedd, Wales, UK

ⓘ Rhodonite

Formula: CaMn₃Mn[Si₅O₁₅]

Localities:

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK
Nant Mine, Nant-y-Gadwen, Aberdaron, Gwynedd, Wales, UK

ⓘ Riebeckite

Formula: ◻[Na₂][Fe²⁺₃Fe³⁺₂]Si₈O₂₂(OH)₂

References:

Fitch, F. J. (1967). Ignimbrite volcanism in north Wales. Bulletin Volcanologique, 30(1), 199-219. doi.org/10.1007/BF02597669

ⓘ Romanèchite

Formula: (Ba,H₂O)₂(Mn⁴⁺,Mn³⁺)₅O₁₀

Locality: Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

ⓘ Sphalerite

Formula: ZnS

Localities:

Penrhyn Du Mine, Abersoch, Llanengan, Gwynedd, Wales, UK
Port Nigel Mine, Llanengan, Llanengan, Gwynedd, Wales, UK
Assheton Mine, Abersoch, Llanengan, Gwynedd, Wales, UK

ⓘ Stevensite

Formula: (Ca,Na)_xMg_3-x(Si₄O₁₀)(OH)₂

Locality: Gimlet Quarry, Pwllheli, Gwynedd, Wales, UK

References:

National Museum of Wales collection

ⓘ Strontianite

Formula: SrCO₃

Locality: Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

ⓘ Tephroite

Formula: Mn²⁺₂SiO₄

Localities:

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK
Nant Mine, Nant-y-Gadwen, Aberdaron, Gwynedd, Wales, UK

Gallery:

PbSO₄ⓘ Anglesite

Anglesite, etc.

Penrhyn Du Mine, Abersoch, Llanengan, Gwynedd, Wales, UK

Anglesite, etc.

Penrhyn Du Mine, Abersoch, Llanengan, Gwynedd, Wales, UK

Anglesite, etc.

Penrhyn Du Mine, Abersoch, Llanengan, Gwynedd, Wales, UK

(Ca,K,Na)(Mn²⁺,Fe²⁺)₁₀(Si,Al)₁₆O₃₈(OH)₈ · nH₂Oⓘ Bannisterite (TL)

Bannisterite

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

Bannisterite

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

Bannisterite

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

(CaCa)(AlAlMn³⁺)O[Si₂O₇][SiO₄](OH)ⓘ Piemontite

Piemontite

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

Piemontite, etc.

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

Piemontite

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

Piemontite, etc.

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

Piemontite

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

Piemontite, etc.

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘ	Native Sulphur	1.CC.05	S₈
Group 2 - Sulphides and Sulfosalts
ⓘ	Bornite	2.BA.15	Cu₅FeS₄
ⓘ	Sphalerite	2.CB.05a	ZnS
ⓘ	Chalcopyrite	2.CB.10a	CuFeS₂
ⓘ	Galena	2.CD.10	PbS
ⓘ	Pyrite	2.EB.05a	FeS₂
Group 3 - Halides
ⓘ	Cotunnite	3.AB.85	PbCl₂
ⓘ	Atacamite	3.DA.10a	Cu₂(OH)₃Cl
ⓘ	Botallackite	3.DA.10b	Cu₂(OH)₃Cl
ⓘ	Cumengeite	3.DB.20	Pb₂₁Cu₂₀Cl₄₂(OH)₄₀ · 6H₂O
Group 4 - Oxides and Hydroxides
ⓘ	Manganosite	4.AB.25	MnO
ⓘ	Jacobsite	4.BB.05	Mn²⁺Fe³⁺₂O₄
ⓘ	Magnetite	4.BB.05	Fe²⁺Fe³⁺₂O₄
ⓘ	Hausmannite	4.BB.10	Mn²⁺Mn³⁺₂O₄
ⓘ	Hematite	4.CB.05	Fe₂O₃
ⓘ	Pyrophanite	4.CB.05	Mn²⁺TiO₃
ⓘ	Bixbyite-(Mn)	4.CB.10	Mn³⁺₂O₃
ⓘ	Quartz var. Chalcedony	4.DA.05	SiO₂
ⓘ		4.DA.05	SiO₂
ⓘ	Pyrolusite	4.DB.05	Mn⁴⁺O₂
ⓘ	Anatase	4.DD.05	TiO₂
ⓘ	Brookite	4.DD.10	TiO₂
ⓘ	Romanèchite	4.DK.10	(Ba,H₂O)₂(Mn⁴⁺,Mn³⁺)₅O₁₀
ⓘ	Manganite	4.FD.15	Mn³⁺O(OH)
ⓘ	Pyrochroite	4.FE.05	Mn(OH)₂
ⓘ	Feitknechtite	4.FE.25	Mn³⁺O(OH)
ⓘ	Birnessite	4.FL.45	(Na,Ca)_0.5(Mn⁴⁺,Mn³⁺)₂O₄ · 1.5H₂O
Group 5 - Nitrates and Carbonates
ⓘ	Calcite	5.AB.05	CaCO₃
ⓘ	Rhodochrosite	5.AB.05	MnCO₃
ⓘ	Cerussite	5.AB.15	PbCO₃
ⓘ	Strontianite	5.AB.15	SrCO₃
ⓘ	Phosgenite	5.BE.20	Pb₂CO₃Cl₂
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘ	Anglesite	7.AD.35	PbSO₄
ⓘ	Baryte	7.AD.35	BaSO₄
ⓘ	Powellite	7.GA.05	Ca(MoO₄)
Group 8 - Phosphates, Arsenates and Vanadates
ⓘ	Fluorapatite	8.BN.05	Ca₅(PO₄)₃F
ⓘ	Pyromorphite	8.BN.05	Pb₅(PO₄)₃Cl
Group 9 - Silicates
ⓘ	Tephroite	9.AC.05	Mn²⁺₂SiO₄
ⓘ	Andradite	9.AD.25	Ca₃Fe³⁺₂(SiO₄)₃
ⓘ	Alleghanyite	9.AF.45	Mn²⁺₅(SiO₄)₂(OH)₂
ⓘ	Axinite-(Fe)	9.BD.20	Ca₂Fe²⁺Al₂BSi₄O₁₅OH
ⓘ	Piemontite-(Sr)	9.BG.05	(CaSr)(AlAlMn³⁺)O[Si₂O₇][SiO₄](OH)
ⓘ	Epidote	9.BG.05a	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
ⓘ	Piemontite	9.BG.05a	(CaCa)(AlAlMn³⁺)O[Si₂O₇][SiO₄](OH)
ⓘ	Epidote-(Sr)	9.BG.05a	(CaSr)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
ⓘ	Riebeckite	9.DE.25	◻[Na₂][Fe²⁺₃Fe³⁺₂]Si₈O₂₂(OH)₂
ⓘ	Pectolite	9.DG.05	NaCa₂Si₃O₈(OH)
ⓘ	Rhodonite	9.DK.05	CaMn₃Mn[Si₅O₁₅]
ⓘ	Pyroxmangite	9.DO.05	Mn²⁺SiO₃
ⓘ	Prehnite	9.DP.20	Ca₂Al₂Si₃O₁₀(OH)₂
ⓘ	Paragonite	9.EC.15	NaAl₂(AlSi₃O₁₀)(OH)₂
ⓘ	Stevensite	9.EC.45	(Ca,Na)_xMg_3-x(Si₄O₁₀)(OH)₂
ⓘ	Pennantite (TL)	9.EC.55	Mn²⁺₅Al(AlSi₃O₁₀)(OH)₈
ⓘ	Caryopilite	9.ED.15	Mn²⁺₃Si₂O₅(OH)₄
ⓘ	Neotocite	9.ED.20	(Mn,Fe)SiO₃ · H₂O (?)
ⓘ	Cymrite (TL)	9.EG.05	BaAl₂Si₂(O,OH)₈ · H₂O
ⓘ	Ganophyllite	9.EG.30	(K,Na,Ca)₂Mn₈(Si,Al)₁₂(O,OH)₃₂ · 8H₂O
ⓘ	Bannisterite (TL)	9.EG.75	(Ca,K,Na)(Mn²⁺,Fe²⁺)₁₀(Si,Al)₁₆O₃₈(OH)₈ · nH₂O
ⓘ	Celsian	9.FA.30	Ba(Al₂Si₂O₈)
ⓘ	Microcline var. Hyalophane	9.FA.30	(K,Ba)[Al(Si,Al)Si₂O₈]
ⓘ	Paracelsian	9.FA.40	Ba(Al₂Si₂O₈)
ⓘ	Banalsite (TL)	9.FA.60	Na₂BaAl₄Si₄O₁₆
ⓘ	Natrolite	9.GA.05	Na₂Al₂Si₃O₁₀ · 2H₂O
ⓘ	Analcime	9.GB.05	Na(AlSi₂O₆) · H₂O
ⓘ	Harmotome	9.GC.10	Ba₂(Si₁₂Al₄)O₃₂ · 12H₂O
Unclassified
ⓘ	'Apophyllite Group'	-	AB₄[Si₈O₂₂]X · 8H₂O
ⓘ	'Biotite'	-	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
ⓘ	'Chlorite Group'	-
ⓘ	'Jacobsite-Q'	-	Mn²⁺(Fe³⁺,Mn³⁺)₂O₄
ⓘ	'Limonite'	-
ⓘ	'Hornblende Root Name Group'	-	◻Ca₂(Z²⁺₄Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂
ⓘ	'Apatite'	-	Ca₅(PO₄)₃(Cl/F/OH)
ⓘ	'Alkali amphibole'	-

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Alleghanyite	Mn₅²⁺(SiO₄)₂(OH)₂
H	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
H	ⓘ Apophyllite Group	AB₄[Si₈O₂₂]X · 8H₂O
H	ⓘ Atacamite	Cu₂(OH)₃Cl
H	ⓘ Bannisterite	(Ca,K,Na)(Mn²⁺,Fe²⁺)₁₀(Si,Al)₁₆O₃₈(OH)₈ · nH₂O
H	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
H	ⓘ Birnessite	(Na,Ca)_0.5(Mn⁴⁺,Mn³⁺)₂O₄ · 1.5H₂O
H	ⓘ Botallackite	Cu₂(OH)₃Cl
H	ⓘ Caryopilite	Mn₃²⁺Si₂O₅(OH)₄
H	ⓘ Cymrite	BaAl₂Si₂(O,OH)₈ · H₂O
H	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
H	ⓘ Axinite-(Fe)	Ca₂Fe²⁺Al₂BSi₄O₁₅OH
H	ⓘ Feitknechtite	Mn³⁺O(OH)
H	ⓘ Ganophyllite	(K,Na,Ca)₂Mn₈(Si,Al)₁₂(O,OH)₃₂ · 8H₂O
H	ⓘ Harmotome	Ba₂(Si₁₂Al₄)O₃₂ · 12H₂O
H	ⓘ Manganite	Mn³⁺O(OH)
H	ⓘ Neotocite	(Mn,Fe)SiO₃ · H₂O (?)
H	ⓘ Natrolite	Na₂Al₂Si₃O₁₀ · 2H₂O
H	ⓘ Paragonite	NaAl₂(AlSi₃O₁₀)(OH)₂
H	ⓘ Pectolite	NaCa₂Si₃O₈(OH)
H	ⓘ Pennantite	Mn₅²⁺Al(AlSi₃O₁₀)(OH)₈
H	ⓘ Piemontite	(CaCa)(AlAlMn³⁺)O[Si₂O₇][SiO₄](OH)
H	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
H	ⓘ Pyrochroite	Mn(OH)₂
H	ⓘ Riebeckite	◻[Na₂][Fe₃²⁺Fe₂³⁺]Si₈O₂₂(OH)₂
H	ⓘ Romanèchite	(Ba,H₂O)₂(Mn⁴⁺,Mn³⁺)₅O₁₀
H	ⓘ Stevensite	(Ca,Na)_xMg_3-x(Si₄O₁₀)(OH)₂
H	ⓘ Piemontite-(Sr)	(CaSr)(AlAlMn³⁺)O[Si₂O₇][SiO₄](OH)
H	ⓘ Cumengeite	Pb₂₁Cu₂₀Cl₄₂(OH)₄₀ · 6H₂O
H	ⓘ Hornblende Root Name Group	◻Ca₂(Z₄²⁺Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂
H	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
H	ⓘ Epidote-(Sr)	(CaSr)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
B	Boron
B	ⓘ Axinite-(Fe)	Ca₂Fe²⁺Al₂BSi₄O₁₅OH
C	Carbon
C	ⓘ Calcite	CaCO₃
C	ⓘ Cerussite	PbCO₃
C	ⓘ Phosgenite	Pb₂CO₃Cl₂
C	ⓘ Rhodochrosite	MnCO₃
C	ⓘ Strontianite	SrCO₃
O	Oxygen
O	ⓘ Alleghanyite	Mn₅²⁺(SiO₄)₂(OH)₂
O	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
O	ⓘ Anatase	TiO₂
O	ⓘ Andradite	Ca₃Fe₂³⁺(SiO₄)₃
O	ⓘ Anglesite	PbSO₄
O	ⓘ Apophyllite Group	AB₄[Si₈O₂₂]X · 8H₂O
O	ⓘ Atacamite	Cu₂(OH)₃Cl
O	ⓘ Banalsite	Na₂BaAl₄Si₄O₁₆
O	ⓘ Bannisterite	(Ca,K,Na)(Mn²⁺,Fe²⁺)₁₀(Si,Al)₁₆O₃₈(OH)₈ · nH₂O
O	ⓘ Baryte	BaSO₄
O	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
O	ⓘ Birnessite	(Na,Ca)_0.5(Mn⁴⁺,Mn³⁺)₂O₄ · 1.5H₂O
O	ⓘ Bixbyite-(Mn)	Mn₂³⁺O₃
O	ⓘ Botallackite	Cu₂(OH)₃Cl
O	ⓘ Brookite	TiO₂
O	ⓘ Calcite	CaCO₃
O	ⓘ Caryopilite	Mn₃²⁺Si₂O₅(OH)₄
O	ⓘ Celsian	Ba(Al₂Si₂O₈)
O	ⓘ Cerussite	PbCO₃
O	ⓘ Quartz var. Chalcedony	SiO₂
O	ⓘ Cymrite	BaAl₂Si₂(O,OH)₈ · H₂O
O	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
O	ⓘ Axinite-(Fe)	Ca₂Fe²⁺Al₂BSi₄O₁₅OH
O	ⓘ Feitknechtite	Mn³⁺O(OH)
O	ⓘ Fluorapatite	Ca₅(PO₄)₃F
O	ⓘ Ganophyllite	(K,Na,Ca)₂Mn₈(Si,Al)₁₂(O,OH)₃₂ · 8H₂O
O	ⓘ Harmotome	Ba₂(Si₁₂Al₄)O₃₂ · 12H₂O
O	ⓘ Hausmannite	Mn²⁺Mn₂³⁺O₄
O	ⓘ Hematite	Fe₂O₃
O	ⓘ Microcline var. Hyalophane	(K,Ba)[Al(Si,Al)Si₂O₈]
O	ⓘ Jacobsite-Q	Mn²⁺(Fe³⁺,Mn³⁺)₂O₄
O	ⓘ Jacobsite	Mn²⁺Fe₂³⁺O₄
O	ⓘ Manganosite	MnO
O	ⓘ Manganite	Mn³⁺O(OH)
O	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
O	ⓘ Neotocite	(Mn,Fe)SiO₃ · H₂O (?)
O	ⓘ Natrolite	Na₂Al₂Si₃O₁₀ · 2H₂O
O	ⓘ Paracelsian	Ba(Al₂Si₂O₈)
O	ⓘ Paragonite	NaAl₂(AlSi₃O₁₀)(OH)₂
O	ⓘ Pectolite	NaCa₂Si₃O₈(OH)
O	ⓘ Pennantite	Mn₅²⁺Al(AlSi₃O₁₀)(OH)₈
O	ⓘ Phosgenite	Pb₂CO₃Cl₂
O	ⓘ Piemontite	(CaCa)(AlAlMn³⁺)O[Si₂O₇][SiO₄](OH)
O	ⓘ Powellite	Ca(MoO₄)
O	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
O	ⓘ Pyrochroite	Mn(OH)₂
O	ⓘ Pyrolusite	Mn⁴⁺O₂
O	ⓘ Pyromorphite	Pb₅(PO₄)₃Cl
O	ⓘ Pyrophanite	Mn²⁺TiO₃
O	ⓘ Pyroxmangite	Mn²⁺SiO₃
O	ⓘ Quartz	SiO₂
O	ⓘ Rhodochrosite	MnCO₃
O	ⓘ Rhodonite	CaMn₃Mn[Si₅O₁₅]
O	ⓘ Riebeckite	◻[Na₂][Fe₃²⁺Fe₂³⁺]Si₈O₂₂(OH)₂
O	ⓘ Romanèchite	(Ba,H₂O)₂(Mn⁴⁺,Mn³⁺)₅O₁₀
O	ⓘ Stevensite	(Ca,Na)_xMg_3-x(Si₄O₁₀)(OH)₂
O	ⓘ Piemontite-(Sr)	(CaSr)(AlAlMn³⁺)O[Si₂O₇][SiO₄](OH)
O	ⓘ Strontianite	SrCO₃
O	ⓘ Tephroite	Mn₂²⁺SiO₄
O	ⓘ Cumengeite	Pb₂₁Cu₂₀Cl₄₂(OH)₄₀ · 6H₂O
O	ⓘ Hornblende Root Name Group	◻Ca₂(Z₄²⁺Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂
O	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
O	ⓘ Epidote-(Sr)	(CaSr)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
F	Fluorine
F	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
F	ⓘ Fluorapatite	Ca₅(PO₄)₃F
F	ⓘ Hornblende Root Name Group	◻Ca₂(Z₄²⁺Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂
F	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
Na	Sodium
Na	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
Na	ⓘ Banalsite	Na₂BaAl₄Si₄O₁₆
Na	ⓘ Bannisterite	(Ca,K,Na)(Mn²⁺,Fe²⁺)₁₀(Si,Al)₁₆O₃₈(OH)₈ · nH₂O
Na	ⓘ Birnessite	(Na,Ca)_0.5(Mn⁴⁺,Mn³⁺)₂O₄ · 1.5H₂O
Na	ⓘ Ganophyllite	(K,Na,Ca)₂Mn₈(Si,Al)₁₂(O,OH)₃₂ · 8H₂O
Na	ⓘ Natrolite	Na₂Al₂Si₃O₁₀ · 2H₂O
Na	ⓘ Paragonite	NaAl₂(AlSi₃O₁₀)(OH)₂
Na	ⓘ Pectolite	NaCa₂Si₃O₈(OH)
Na	ⓘ Riebeckite	◻[Na₂][Fe₃²⁺Fe₂³⁺]Si₈O₂₂(OH)₂
Na	ⓘ Stevensite	(Ca,Na)_xMg_3-x(Si₄O₁₀)(OH)₂
Mg	Magnesium
Mg	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Mg	ⓘ Stevensite	(Ca,Na)_xMg_3-x(Si₄O₁₀)(OH)₂
Al	Aluminium
Al	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
Al	ⓘ Banalsite	Na₂BaAl₄Si₄O₁₆
Al	ⓘ Bannisterite	(Ca,K,Na)(Mn²⁺,Fe²⁺)₁₀(Si,Al)₁₆O₃₈(OH)₈ · nH₂O
Al	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Al	ⓘ Celsian	Ba(Al₂Si₂O₈)
Al	ⓘ Cymrite	BaAl₂Si₂(O,OH)₈ · H₂O
Al	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
Al	ⓘ Axinite-(Fe)	Ca₂Fe²⁺Al₂BSi₄O₁₅OH
Al	ⓘ Ganophyllite	(K,Na,Ca)₂Mn₈(Si,Al)₁₂(O,OH)₃₂ · 8H₂O
Al	ⓘ Harmotome	Ba₂(Si₁₂Al₄)O₃₂ · 12H₂O
Al	ⓘ Microcline var. Hyalophane	(K,Ba)[Al(Si,Al)Si₂O₈]
Al	ⓘ Natrolite	Na₂Al₂Si₃O₁₀ · 2H₂O
Al	ⓘ Paracelsian	Ba(Al₂Si₂O₈)
Al	ⓘ Paragonite	NaAl₂(AlSi₃O₁₀)(OH)₂
Al	ⓘ Pennantite	Mn₅²⁺Al(AlSi₃O₁₀)(OH)₈
Al	ⓘ Piemontite	(CaCa)(AlAlMn³⁺)O[Si₂O₇][SiO₄](OH)
Al	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
Al	ⓘ Piemontite-(Sr)	(CaSr)(AlAlMn³⁺)O[Si₂O₇][SiO₄](OH)
Al	ⓘ Hornblende Root Name Group	◻Ca₂(Z₄²⁺Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂
Al	ⓘ Epidote-(Sr)	(CaSr)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
Si	Silicon
Si	ⓘ Alleghanyite	Mn₅²⁺(SiO₄)₂(OH)₂
Si	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
Si	ⓘ Andradite	Ca₃Fe₂³⁺(SiO₄)₃
Si	ⓘ Apophyllite Group	AB₄[Si₈O₂₂]X · 8H₂O
Si	ⓘ Banalsite	Na₂BaAl₄Si₄O₁₆
Si	ⓘ Bannisterite	(Ca,K,Na)(Mn²⁺,Fe²⁺)₁₀(Si,Al)₁₆O₃₈(OH)₈ · nH₂O
Si	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Si	ⓘ Caryopilite	Mn₃²⁺Si₂O₅(OH)₄
Si	ⓘ Celsian	Ba(Al₂Si₂O₈)
Si	ⓘ Quartz var. Chalcedony	SiO₂
Si	ⓘ Cymrite	BaAl₂Si₂(O,OH)₈ · H₂O
Si	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
Si	ⓘ Axinite-(Fe)	Ca₂Fe²⁺Al₂BSi₄O₁₅OH
Si	ⓘ Ganophyllite	(K,Na,Ca)₂Mn₈(Si,Al)₁₂(O,OH)₃₂ · 8H₂O
Si	ⓘ Harmotome	Ba₂(Si₁₂Al₄)O₃₂ · 12H₂O
Si	ⓘ Microcline var. Hyalophane	(K,Ba)[Al(Si,Al)Si₂O₈]
Si	ⓘ Neotocite	(Mn,Fe)SiO₃ · H₂O (?)
Si	ⓘ Natrolite	Na₂Al₂Si₃O₁₀ · 2H₂O
Si	ⓘ Paracelsian	Ba(Al₂Si₂O₈)
Si	ⓘ Paragonite	NaAl₂(AlSi₃O₁₀)(OH)₂
Si	ⓘ Pectolite	NaCa₂Si₃O₈(OH)
Si	ⓘ Pennantite	Mn₅²⁺Al(AlSi₃O₁₀)(OH)₈
Si	ⓘ Piemontite	(CaCa)(AlAlMn³⁺)O[Si₂O₇][SiO₄](OH)
Si	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
Si	ⓘ Pyroxmangite	Mn²⁺SiO₃
Si	ⓘ Quartz	SiO₂
Si	ⓘ Rhodonite	CaMn₃Mn[Si₅O₁₅]
Si	ⓘ Riebeckite	◻[Na₂][Fe₃²⁺Fe₂³⁺]Si₈O₂₂(OH)₂
Si	ⓘ Stevensite	(Ca,Na)_xMg_3-x(Si₄O₁₀)(OH)₂
Si	ⓘ Piemontite-(Sr)	(CaSr)(AlAlMn³⁺)O[Si₂O₇][SiO₄](OH)
Si	ⓘ Tephroite	Mn₂²⁺SiO₄
Si	ⓘ Hornblende Root Name Group	◻Ca₂(Z₄²⁺Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂
Si	ⓘ Epidote-(Sr)	(CaSr)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
P	Phosphorus
P	ⓘ Fluorapatite	Ca₅(PO₄)₃F
P	ⓘ Pyromorphite	Pb₅(PO₄)₃Cl
P	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
S	Sulfur
S	ⓘ Anglesite	PbSO₄
S	ⓘ Baryte	BaSO₄
S	ⓘ Bornite	Cu₅FeS₄
S	ⓘ Chalcopyrite	CuFeS₂
S	ⓘ Galena	PbS
S	ⓘ Pyrite	FeS₂
S	ⓘ Sphalerite	ZnS
S	ⓘ Native Sulphur	S₈
Cl	Chlorine
Cl	ⓘ Atacamite	Cu₂(OH)₃Cl
Cl	ⓘ Botallackite	Cu₂(OH)₃Cl
Cl	ⓘ Cotunnite	PbCl₂
Cl	ⓘ Phosgenite	Pb₂CO₃Cl₂
Cl	ⓘ Pyromorphite	Pb₅(PO₄)₃Cl
Cl	ⓘ Cumengeite	Pb₂₁Cu₂₀Cl₄₂(OH)₄₀ · 6H₂O
Cl	ⓘ Hornblende Root Name Group	◻Ca₂(Z₄²⁺Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂
Cl	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
K	Potassium
K	ⓘ Bannisterite	(Ca,K,Na)(Mn²⁺,Fe²⁺)₁₀(Si,Al)₁₆O₃₈(OH)₈ · nH₂O
K	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
K	ⓘ Ganophyllite	(K,Na,Ca)₂Mn₈(Si,Al)₁₂(O,OH)₃₂ · 8H₂O
K	ⓘ Microcline var. Hyalophane	(K,Ba)[Al(Si,Al)Si₂O₈]
Ca	Calcium
Ca	ⓘ Andradite	Ca₃Fe₂³⁺(SiO₄)₃
Ca	ⓘ Bannisterite	(Ca,K,Na)(Mn²⁺,Fe²⁺)₁₀(Si,Al)₁₆O₃₈(OH)₈ · nH₂O
Ca	ⓘ Birnessite	(Na,Ca)_0.5(Mn⁴⁺,Mn³⁺)₂O₄ · 1.5H₂O
Ca	ⓘ Calcite	CaCO₃
Ca	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
Ca	ⓘ Axinite-(Fe)	Ca₂Fe²⁺Al₂BSi₄O₁₅OH
Ca	ⓘ Fluorapatite	Ca₅(PO₄)₃F
Ca	ⓘ Ganophyllite	(K,Na,Ca)₂Mn₈(Si,Al)₁₂(O,OH)₃₂ · 8H₂O
Ca	ⓘ Pectolite	NaCa₂Si₃O₈(OH)
Ca	ⓘ Piemontite	(CaCa)(AlAlMn³⁺)O[Si₂O₇][SiO₄](OH)
Ca	ⓘ Powellite	Ca(MoO₄)
Ca	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
Ca	ⓘ Rhodonite	CaMn₃Mn[Si₅O₁₅]
Ca	ⓘ Stevensite	(Ca,Na)_xMg_3-x(Si₄O₁₀)(OH)₂
Ca	ⓘ Piemontite-(Sr)	(CaSr)(AlAlMn³⁺)O[Si₂O₇][SiO₄](OH)
Ca	ⓘ Hornblende Root Name Group	◻Ca₂(Z₄²⁺Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂
Ca	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
Ca	ⓘ Epidote-(Sr)	(CaSr)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
Ti	Titanium
Ti	ⓘ Anatase	TiO₂
Ti	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Ti	ⓘ Brookite	TiO₂
Ti	ⓘ Pyrophanite	Mn²⁺TiO₃
Mn	Manganese
Mn	ⓘ Alleghanyite	Mn₅²⁺(SiO₄)₂(OH)₂
Mn	ⓘ Bannisterite	(Ca,K,Na)(Mn²⁺,Fe²⁺)₁₀(Si,Al)₁₆O₃₈(OH)₈ · nH₂O
Mn	ⓘ Birnessite	(Na,Ca)_0.5(Mn⁴⁺,Mn³⁺)₂O₄ · 1.5H₂O
Mn	ⓘ Bixbyite-(Mn)	Mn₂³⁺O₃
Mn	ⓘ Caryopilite	Mn₃²⁺Si₂O₅(OH)₄
Mn	ⓘ Feitknechtite	Mn³⁺O(OH)
Mn	ⓘ Ganophyllite	(K,Na,Ca)₂Mn₈(Si,Al)₁₂(O,OH)₃₂ · 8H₂O
Mn	ⓘ Hausmannite	Mn²⁺Mn₂³⁺O₄
Mn	ⓘ Jacobsite-Q	Mn²⁺(Fe³⁺,Mn³⁺)₂O₄
Mn	ⓘ Jacobsite	Mn²⁺Fe₂³⁺O₄
Mn	ⓘ Manganosite	MnO
Mn	ⓘ Manganite	Mn³⁺O(OH)
Mn	ⓘ Neotocite	(Mn,Fe)SiO₃ · H₂O (?)
Mn	ⓘ Pennantite	Mn₅²⁺Al(AlSi₃O₁₀)(OH)₈
Mn	ⓘ Piemontite	(CaCa)(AlAlMn³⁺)O[Si₂O₇][SiO₄](OH)
Mn	ⓘ Pyrochroite	Mn(OH)₂
Mn	ⓘ Pyrolusite	Mn⁴⁺O₂
Mn	ⓘ Pyrophanite	Mn²⁺TiO₃
Mn	ⓘ Pyroxmangite	Mn²⁺SiO₃
Mn	ⓘ Rhodochrosite	MnCO₃
Mn	ⓘ Rhodonite	CaMn₃Mn[Si₅O₁₅]
Mn	ⓘ Romanèchite	(Ba,H₂O)₂(Mn⁴⁺,Mn³⁺)₅O₁₀
Mn	ⓘ Piemontite-(Sr)	(CaSr)(AlAlMn³⁺)O[Si₂O₇][SiO₄](OH)
Mn	ⓘ Tephroite	Mn₂²⁺SiO₄
Fe	Iron
Fe	ⓘ Andradite	Ca₃Fe₂³⁺(SiO₄)₃
Fe	ⓘ Bannisterite	(Ca,K,Na)(Mn²⁺,Fe²⁺)₁₀(Si,Al)₁₆O₃₈(OH)₈ · nH₂O
Fe	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Fe	ⓘ Bornite	Cu₅FeS₄
Fe	ⓘ Chalcopyrite	CuFeS₂
Fe	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
Fe	ⓘ Axinite-(Fe)	Ca₂Fe²⁺Al₂BSi₄O₁₅OH
Fe	ⓘ Hematite	Fe₂O₃
Fe	ⓘ Jacobsite-Q	Mn²⁺(Fe³⁺,Mn³⁺)₂O₄
Fe	ⓘ Jacobsite	Mn²⁺Fe₂³⁺O₄
Fe	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
Fe	ⓘ Neotocite	(Mn,Fe)SiO₃ · H₂O (?)
Fe	ⓘ Pyrite	FeS₂
Fe	ⓘ Riebeckite	◻[Na₂][Fe₃²⁺Fe₂³⁺]Si₈O₂₂(OH)₂
Fe	ⓘ Epidote-(Sr)	(CaSr)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
Cu	Copper
Cu	ⓘ Atacamite	Cu₂(OH)₃Cl
Cu	ⓘ Bornite	Cu₅FeS₄
Cu	ⓘ Botallackite	Cu₂(OH)₃Cl
Cu	ⓘ Chalcopyrite	CuFeS₂
Cu	ⓘ Cumengeite	Pb₂₁Cu₂₀Cl₄₂(OH)₄₀ · 6H₂O
Zn	Zinc
Zn	ⓘ Sphalerite	ZnS
Sr	Strontium
Sr	ⓘ Piemontite-(Sr)	(CaSr)(AlAlMn³⁺)O[Si₂O₇][SiO₄](OH)
Sr	ⓘ Strontianite	SrCO₃
Sr	ⓘ Epidote-(Sr)	(CaSr)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
Mo	Molybdenum
Mo	ⓘ Powellite	Ca(MoO₄)
Ba	Barium
Ba	ⓘ Banalsite	Na₂BaAl₄Si₄O₁₆
Ba	ⓘ Baryte	BaSO₄
Ba	ⓘ Celsian	Ba(Al₂Si₂O₈)
Ba	ⓘ Cymrite	BaAl₂Si₂(O,OH)₈ · H₂O
Ba	ⓘ Harmotome	Ba₂(Si₁₂Al₄)O₃₂ · 12H₂O
Ba	ⓘ Microcline var. Hyalophane	(K,Ba)[Al(Si,Al)Si₂O₈]
Ba	ⓘ Paracelsian	Ba(Al₂Si₂O₈)
Ba	ⓘ Romanèchite	(Ba,H₂O)₂(Mn⁴⁺,Mn³⁺)₅O₁₀
Pb	Lead
Pb	ⓘ Anglesite	PbSO₄
Pb	ⓘ Cerussite	PbCO₃
Pb	ⓘ Cotunnite	PbCl₂
Pb	ⓘ Galena	PbS
Pb	ⓘ Phosgenite	Pb₂CO₃Cl₂
Pb	ⓘ Pyromorphite	Pb₅(PO₄)₃Cl
Pb	ⓘ Cumengeite	Pb₂₁Cu₂₀Cl₄₂(OH)₄₀ · 6H₂O

Fossils

There are 4 fossil localities from the PaleoBioDB database within this region.

These data are provided on an experimental basis and are taken from external databases. Mindat.org has no control currently over the accuracy of these data.

Occurrences

Youngest Fossil Listed

419 Ma (Early/Lower Devonian)

Oldest Fossil Listed

520 Ma (Cambrian)

Stratigraphic Units

Click here to view 7 stratigraphic units.

Fossils from Region

Click here to show the list.

Accepted Name	Hierarchy	Age
Porifera phylum	Animalia : Porifera	520 - 516 Ma Cambrian
Hexactinellida class	Animalia : Porifera : Hexactinellida	520 - 516 Ma Cambrian
Trilobita class	Animalia : Arthropoda : Trilobita	520 - 516 Ma Cambrian
Leptochilodiscus genus	Animalia : Arthropoda : Trilobita : Agnostida : Weymouthiidae : *Leptochilodiscus*	520 - 516 Ma Cambrian
Serrodiscus genus	Animalia : Arthropoda : Trilobita : Agnostida : Weymouthiidae : *Serrodiscus*	520 - 516 Ma Cambrian
Illaenus genus	Animalia : Arthropoda : Trilobita : Corynexochida : Illaenidae : *Illaenus*	457.5 - 452 Ma Late/Upper Ordovician
Stenopareia genus	Animalia : Arthropoda : Trilobita : Corynexochida : Illaenidae : *Stenopareia*	457.5 - 452 Ma Late/Upper Ordovician
Conolichas genus	Animalia : Arthropoda : Trilobita : Lichida : Lichidae : *Conolichas*	457.5 - 452 Ma Late/Upper Ordovician
Primaspis genus	Animalia : Arthropoda : Trilobita : Lichida : Odontopleuridae : *Primaspis*	457.5 - 452 Ma Late/Upper Ordovician
Remopleurides genus	Animalia : Arthropoda : Trilobita : Asaphida : Remopleurididae : *Remopleurides*	457.5 - 452 Ma Late/Upper Ordovician
Hamatolenus genus	Animalia : Arthropoda : Trilobita : Ptychopariida : Ellipsocephalidae : *Hamatolenus*	520 - 516 Ma Cambrian
Decoroproetus genus	Animalia : Arthropoda : Trilobita : Proetida : Proetidae : *Decoroproetus*	457.5 - 452 Ma Late/Upper Ordovician
Harpidella genus	Animalia : Arthropoda : Trilobita : Proetida : Aulacopleuridae : *Harpidella*	457.5 - 452 Ma Late/Upper Ordovician
Scopelochasmops genus	Animalia : Arthropoda : Trilobita : Phacopida : Pterygometopidae : *Scopelochasmops*	457.5 - 452 Ma Late/Upper Ordovician
Lingulella genus	Animalia : Brachiopoda : Lingulata : Lingulida : Obolidae : *Lingulella*	520 - 516 Ma Cambrian
Dalmanella genus	Animalia : Brachiopoda : Rhynchonellata : Orthida : Dalmanellidae : *Dalmanella*	457.5 - 452 Ma Late/Upper Ordovician
Howellites genus	Animalia : Brachiopoda : Rhynchonellata : Orthida : Dalmanellidae : *Howellites*	457.5 - 452 Ma Late/Upper Ordovician
Kjaerina genus	Animalia : Brachiopoda : Strophomenata : Strophomenida : Rafinesquinidae : *Kjaerina*	457.5 - 452 Ma Late/Upper Ordovician
Sowerbyella genus	Animalia : Brachiopoda : Strophomenata : Strophomenida : Sowerbyellidae : *Sowerbyella*	457.5 - 452 Ma Late/Upper Ordovician
Oulodus genus	Animalia : Chordata : Hibbardellidae : *Oulodus*	425.6 - 423 Ma Silurian
Thelodus genus	Animalia : Chordata : Loganelliidae : *Thelodus*	425.6 - 423 Ma Silurian
Planolites genus	Animalia : *Planolites*	520 - 516 Ma Cambrian
Thelodus parvidens species	Animalia : Chordata : Loganelliidae : Thelodus : *Thelodus parvidens*	427.4 - 419.2 Ma Paleozoic
Wurmiella excavata species	Animalia : Chordata : Conodonta : Ozarkodinida : Spathognathodontodae : Wurmiella : *Wurmiella excavata*	425.6 - 423 Ma Silurian
Ozarkodina confluens species	Animalia : Chordata : Conodonta : Ozarkodinida : Ozarkodina : *Ozarkodina confluens*	427.4 - 419.2 Ma Paleozoic
Paraproetus brevifrons species	Animalia : Arthropoda : Trilobita : Proetida : Proetidae : Paraproetus : *Paraproetus brevifrons*	455.8 - 445.6 Ma Late/Upper Ordovician
Nicollidina remscheidensis species	Animalia : Chordata : Conodonta : Ozarkodinida : Nicollidina : *Nicollidina remscheidensis*	425.6 - 423 Ma Silurian
Paralogania ludlowiensis species	Animalia : Chordata : Agnatha : Loganelliformes : Loganelliidae : Paralogania : *Paralogania ludlowiensis*	425.6 - 419.2 Ma Paleozoic
Nethertonodus prodigialis species	Animalia : Chordata : Shieliiformes : Shieliidae : Nethertonodus : *Nethertonodus prodigialis*	427.4 - 423 Ma Silurian
Thelodus trilobatus species	Animalia : Chordata : Loganelliidae : Thelodus : *Thelodus trilobatus*	425.6 - 419.2 Ma Paleozoic
Ozarkodina snajdri species	Animalia : Chordata : Conodonta : Ozarkodinida : Ozarkodina : *Ozarkodina snajdri*	425.6 - 423 Ma Silurian
Coryssognathus dubius species	Animalia : Chordata : Conodonta : Conodontophorida : Coryssognathus : *Coryssognathus dubius*	427.4 - 419.2 Ma Paleozoic
Kloucekia apiculata species	Animalia : Arthropoda : Trilobita : Phacopida : Acastidae : Kloucekia : *Kloucekia apiculata*	457.5 - 452 Ma Late/Upper Ordovician
Allolichas nodulosus species	Animalia : Arthropoda : Trilobita : Lichida : Lichidae : Allolichas : *Allolichas nodulosus*	457.5 - 452 Ma Late/Upper Ordovician
Deacybele pauca species	Animalia : Arthropoda : Trilobita : Phacopida : Encrinuridae : Deacybele : *Deacybele pauca*	457.5 - 452 Ma Late/Upper Ordovician
Flexicalymene planimarginata species	Animalia : Arthropoda : Trilobita : Phacopida : Calymenidae : Flexicalymene : *Flexicalymene planimarginata*	457.5 - 452 Ma Late/Upper Ordovician
Brongniartella minor species	Animalia : Arthropoda : Trilobita : Phacopida : Homalonotidae : Brongniartella : *Brongniartella minor*	457.5 - 452 Ma Late/Upper Ordovician
Broeggerolithus nicholsoni species	Animalia : Arthropoda : Trilobita : Asaphida : Trinucleidae : Broeggerolithus : *Broeggerolithus nicholsoni*	457.5 - 452 Ma Late/Upper Ordovician
Runcinodiscus index species	Animalia : Arthropoda : Trilobita : Agnostida : Weymouthiidae : Runcinodiscus : *Runcinodiscus index*	520 - 516 Ma Cambrian

Fossil Localities

Click to show 4 fossil localities

Wales
- Gwynedd

Localities in this Region

Wales
- Gwynedd
  - ⭔Aberdaron
    - Nant-y-Gadwen
      - Nant Mine
    - Rhiw
      - Benallt Mine
      - Rhiw Mine
  - Llanaelhaearn
    - Trwyn-y-tal
  - ⭔Llanengan
    - ⭔Abersoch
      - Abersoch beach

Wales
- Gwynedd
  - Llanengan
    - Abersoch
      - Assheton Mine
      - Penrhyn Du Mine
    - ⭔Llanengan
      - Port Nigel Mine
  - Llannor
    - Pen-y-chain
  - ⭔Nefyn
    - ⭔Porth Dinllaen
      - Carreg Ddu
  - ⭔Pwllheli
    - Gimlet Quarry

Other Regions, Features and Areas that Intersect

British and Irish IslesGroup of Islands

Eurasian PlateTectonic Plate

AvaloniaVolcanic Arc

Wales
- Cambrian MountainsMountain Range

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Fitch, F. J. (1967). Ignimbrite volcanism in north Wales. Bulletin Volcanologique, 30(1), 199-219. doi.org/10.1007/BF02597669

Woolley, Alan R. (2019) Alkaline Rocks and Carbonatites of the World. Part 4: Antarctica, Asia and Europe (excluding the former USSR), Australasia and Oceanic Islands. The Geological Society of London. doi:10.1144/mpar4

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Lleyn Peninsula, Gwynedd, Wales, UKiRegional Level TypesLleyn PeninsulaPeninsula GwyneddCounty WalesCountry UKCountry function showexplain() { $("#locexplain").toggle(); if (typeof movemap === "function") movemap(); }

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Detailed Mineral List:

Gallery:

List of minerals arranged by Strunz 10th Edition classification

List of minerals for each chemical element

Fossils

Localities in this Region

Other Regions, Features and Areas that Intersect

References

Lleyn Peninsula, Gwynedd, Wales, UK i
Regional Level Types
Lleyn Peninsula Peninsula
Gwynedd County
Wales Country
UK Country