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Dean Quarry, St Keverne, Cornwall, England, UKi
| Regional Level Types | |
|---|---|
| Dean Quarry | Quarry (Inactive) |
| St Keverne | Civil Parish |
| Cornwall | County |
| England | Constituent Country |
| UK | Country |
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Latitude & Longitude (WGS84):
50° 2' 32'' North , 5° 4' 7'' West
Latitude & Longitude (decimal):
UK National Grid Reference:
SW803204
Type:
Quarry (Inactive) - last checked 2020
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Coverack | 255 (2017) | 2.8km |
| Ruan Minor | 558 (2017) | 9.8km |
| Constantine | 819 (2017) | 11.4km |
| Gweek | 667 (2017) | 11.5km |
| Falmouth | 31,988 (2017) | 12.4km |
Located about 1.5 km SE of St Keverne, Dean quarry is adjacent to Dean Point on the east coast of the Lizard Peninsula and is developed in a large intrusion of gabbro that extends from Coverack to St Keverne and from Manacle Point to Trelan. The gabbro, which varies in texture from schistose to pegmatitic (pyroxenes to 25 cm), was described in detail in J. S. Flett (1946) Geology of the Lizard and Meneage (BGS Memoir).
A.F. Seager (1969) wrote that he had visited the quarry for 15 years without finding anything of unusual mineralogical interest, but on a visit in 1967 found zeolites lining vughs in the altered dolerite. Since then the quarry has been a notable Cornish locality for crystallised analcime, natrolite, stilbite, prehnite and calcite in particular.
Worked commercially up until 2005, more recently (2018) a proposal was made to develop the site into a mega-quarry. Five million tonnes of rock would be extracted which would be shipped to Swansea Bay in Wales to create 6.5 miles of breakwaters for an artificial lagoon that would generate electricity from the changing tides. This met with significant opposition from the local community in Cornwall, and later the UK Government formally turned down the bid to build the £1.3 billion lagoon on economic grounds.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
23 valid minerals.
Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
| ⓘ Analcime Formula: Na(AlSi2O6) · H2O References: |
| ⓘ Anorthite Formula: Ca(Al2Si2O8) |
| ⓘ Anorthite var. Labradorite Formula: (Ca,Na)[Al(Al,Si)Si2O8] |
| ⓘ Calcite Formula: CaCO3 References: |
| ⓘ 'Chabazite' References: |
| ⓘ Chalcocite Formula: Cu2S Description: Collected by Mike Merry and Dr Ruth Osborne in 1995 from the bottom bench. References: Collected by Mike Merry.Identified by Paul De Bondt: Visual Identification |
| ⓘ Chalcopyrite Formula: CuFeS2 Description: Collected by Mike Merry and Dr Ruth Osborne in 1995 from the bottom bench. References: Collected by Mike Merry.Identified by Paul De Bondt: Visual Identification |
| ⓘ Cuprite Formula: Cu2O References: Collected by Mike Merry.Identified by Paul De Bondt: Visual Identification |
| ⓘ Cuprite var. Chalcotrichite Formula: Cu2O Description: Collected by Mike Merry and Dr Ruth Osborne in 1995 from the bottom bench. References: Collected by Mike Merry.Identified by Paul De Bondt: Visual Identification |
| ⓘ Djurleite Formula: Cu31S16 |
| ⓘ Enstatite Formula: Mg2Si2O6 |
| ⓘ Galena Formula: PbS |
| ⓘ 'Gmelinite Subgroup' |
| ⓘ Gyrolite Formula: NaCa16Si23AlO60(OH)8 · 14H2O |
| ⓘ 'Heulandite Subgroup' Formula: (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
| ⓘ 'Hornblende Root Name Group' Formula: ◻Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2 |
| ⓘ 'Kerolite' Formula: (Mg,Ni)3Si4O10(OH)2 · nH2O (n ~ 1) References: |
| ⓘ 'K Feldspar' ? References: |
| ⓘ 'K Feldspar var. Adularia' ? Formula: KAlSi3O8 References: |
| ⓘ Magnetite Formula: Fe2+Fe3+2O4 |
| ⓘ Marcasite Formula: FeS2 |
| ⓘ Montmorillonite Formula: (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
| ⓘ Mottramite Formula: PbCu(VO4)(OH) |
| ⓘ Natrolite Formula: Na2Al2Si3O10 · 2H2O References: |
| ⓘ Orthoclase Formula: K(AlSi3O8) |
| ⓘ Pectolite Formula: NaCa2Si3O8(OH) |
| ⓘ Prehnite Formula: Ca2Al2Si3O10(OH)2 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Scolecite Formula: CaAl2Si3O10 · 3H2O Description: Wilson et al. (2008): "No XRD was carried out on this sample but calcium was shown to be present by chemical testing. The sample is in Plymouth Museum. Mindat, and Golley and Williams (1995), list scolecite at Dean Quarry but without a defining reference." |
| ⓘ Stevensite Formula: (Ca,Na)xMg3-x(Si4O10)(OH)2 |
| ⓘ Stilbite-Ca Formula: NaCa4(Si27Al9)O72 · 28H2O |
| ⓘ 'Stilbite Subgroup' Formula: M6-7[Al8-9Si27-28O72] · nH2O |
| ⓘ Volborthite ? Formula: Cu3(V2O7)(OH)2 · 2H2O Description: A mineral which is almost certainly volborthite occurs as minute yellow to yellow green spherules (up to about 0.3 mm across) in fractures in the rock. Insufficient material was available for analysis by XRD, but EDS produced a trace which is typical of volborthite. Identification can only be tentative without a confirmatory analysis by XRD, but the data is included in the hope that a detailed examination of further specimens will reveal sufficient material. |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Chalcocite | 2.BA.05 | Cu2S |
| ⓘ | Djurleite | 2.BA.05 | Cu31S16 |
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Marcasite | 2.EB.10a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Cuprite var. Chalcotrichite | 4.AA.10 | Cu2O |
| ⓘ | 4.AA.10 | Cu2O | |
| ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| Group 8 - Phosphates, Arsenates and Vanadates | |||
| ⓘ | Mottramite | 8.BH.40 | PbCu(VO4)(OH) |
| ⓘ | Volborthite ? | 8.FD.05 | Cu3(V2O7)(OH)2 · 2H2O |
| Group 9 - Silicates | |||
| ⓘ | Enstatite | 9.DA.05 | Mg2Si2O6 |
| ⓘ | Pectolite | 9.DG.05 | NaCa2Si3O8(OH) |
| ⓘ | Prehnite | 9.DP.20 | Ca2Al2Si3O10(OH)2 |
| ⓘ | Montmorillonite | 9.EC.40 | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
| ⓘ | Stevensite | 9.EC.45 | (Ca,Na)xMg3-x(Si4O10)(OH)2 |
| ⓘ | Gyrolite | 9.EE.30 | NaCa16Si23AlO60(OH)8 · 14H2O |
| ⓘ | Orthoclase | 9.FA.30 | K(AlSi3O8) |
| ⓘ | Anorthite | 9.FA.35 | Ca(Al2Si2O8) |
| ⓘ | var. Labradorite | 9.FA.35 | (Ca,Na)[Al(Al,Si)Si2O8] |
| ⓘ | Natrolite | 9.GA.05 | Na2Al2Si3O10 · 2H2O |
| ⓘ | Scolecite | 9.GA.05 | CaAl2Si3O10 · 3H2O |
| ⓘ | Analcime | 9.GB.05 | Na(AlSi2O6) · H2O |
| ⓘ | Stilbite-Ca | 9.GE.10 | NaCa4(Si27Al9)O72 · 28H2O |
| Unclassified | |||
| ⓘ | 'K Feldspar var. Adularia' ? | - | KAlSi3O8 |
| ⓘ | 'Chabazite' | - | |
| ⓘ | 'Gmelinite Subgroup' | - | |
| ⓘ | 'Heulandite Subgroup' | - | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
| ⓘ | 'Stilbite Subgroup' | - | M6-7[Al8-9Si27-28O72] · nH2O |
| ⓘ | 'Kerolite' | - | (Mg,Ni)3Si4O10(OH)2 · nH2O (n ~ 1) |
| ⓘ | 'Hornblende Root Name Group' | - | ◻Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2 |
| ⓘ | 'K Feldspar' ? | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Analcime | Na(AlSi2O6) · H2O |
| H | ⓘ Gyrolite | NaCa16Si23AlO60(OH)8 · 14H2O |
| H | ⓘ Heulandite Subgroup | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
| H | ⓘ Mottramite | PbCu(VO4)(OH) |
| H | ⓘ Montmorillonite | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
| H | ⓘ Natrolite | Na2Al2Si3O10 · 2H2O |
| H | ⓘ Pectolite | NaCa2Si3O8(OH) |
| H | ⓘ Prehnite | Ca2Al2Si3O10(OH)2 |
| H | ⓘ Scolecite | CaAl2Si3O10 · 3H2O |
| H | ⓘ Stevensite | (Ca,Na)xMg3-x(Si4O10)(OH)2 |
| H | ⓘ Stilbite Subgroup | M6-7[Al8-9Si27-28O72] · nH2O |
| H | ⓘ Volborthite | Cu3(V2O7)(OH)2 · 2H2O |
| H | ⓘ Kerolite | (Mg,Ni)3Si4O10(OH)2 · nH2O (n ~ 1) |
| H | ⓘ Stilbite-Ca | NaCa4(Si27Al9)O72 · 28H2O |
| H | ⓘ Hornblende Root Name Group | ◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2 |
| C | Carbon | |
| C | ⓘ Calcite | CaCO3 |
| O | Oxygen | |
| O | ⓘ K Feldspar var. Adularia | KAlSi3O8 |
| O | ⓘ Analcime | Na(AlSi2O6) · H2O |
| O | ⓘ Anorthite | Ca(Al2Si2O8) |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Cuprite var. Chalcotrichite | Cu2O |
| O | ⓘ Cuprite | Cu2O |
| O | ⓘ Enstatite | Mg2Si2O6 |
| O | ⓘ Gyrolite | NaCa16Si23AlO60(OH)8 · 14H2O |
| O | ⓘ Heulandite Subgroup | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
| O | ⓘ Anorthite var. Labradorite | (Ca,Na)[Al(Al,Si)Si2O8] |
| O | ⓘ Magnetite | Fe2+Fe23+O4 |
| O | ⓘ Mottramite | PbCu(VO4)(OH) |
| O | ⓘ Montmorillonite | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
| O | ⓘ Natrolite | Na2Al2Si3O10 · 2H2O |
| O | ⓘ Orthoclase | K(AlSi3O8) |
| O | ⓘ Pectolite | NaCa2Si3O8(OH) |
| O | ⓘ Prehnite | Ca2Al2Si3O10(OH)2 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Scolecite | CaAl2Si3O10 · 3H2O |
| O | ⓘ Stevensite | (Ca,Na)xMg3-x(Si4O10)(OH)2 |
| O | ⓘ Stilbite Subgroup | M6-7[Al8-9Si27-28O72] · nH2O |
| O | ⓘ Volborthite | Cu3(V2O7)(OH)2 · 2H2O |
| O | ⓘ Kerolite | (Mg,Ni)3Si4O10(OH)2 · nH2O (n ~ 1) |
| O | ⓘ Stilbite-Ca | NaCa4(Si27Al9)O72 · 28H2O |
| O | ⓘ Hornblende Root Name Group | ◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2 |
| F | Fluorine | |
| F | ⓘ Hornblende Root Name Group | ◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2 |
| Na | Sodium | |
| Na | ⓘ Analcime | Na(AlSi2O6) · H2O |
| Na | ⓘ Gyrolite | NaCa16Si23AlO60(OH)8 · 14H2O |
| Na | ⓘ Heulandite Subgroup | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
| Na | ⓘ Anorthite var. Labradorite | (Ca,Na)[Al(Al,Si)Si2O8] |
| Na | ⓘ Montmorillonite | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
| Na | ⓘ Natrolite | Na2Al2Si3O10 · 2H2O |
| Na | ⓘ Pectolite | NaCa2Si3O8(OH) |
| Na | ⓘ Stevensite | (Ca,Na)xMg3-x(Si4O10)(OH)2 |
| Na | ⓘ Stilbite-Ca | NaCa4(Si27Al9)O72 · 28H2O |
| Mg | Magnesium | |
| Mg | ⓘ Enstatite | Mg2Si2O6 |
| Mg | ⓘ Montmorillonite | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
| Mg | ⓘ Stevensite | (Ca,Na)xMg3-x(Si4O10)(OH)2 |
| Mg | ⓘ Kerolite | (Mg,Ni)3Si4O10(OH)2 · nH2O (n ~ 1) |
| Al | Aluminium | |
| Al | ⓘ K Feldspar var. Adularia | KAlSi3O8 |
| Al | ⓘ Analcime | Na(AlSi2O6) · H2O |
| Al | ⓘ Anorthite | Ca(Al2Si2O8) |
| Al | ⓘ Gyrolite | NaCa16Si23AlO60(OH)8 · 14H2O |
| Al | ⓘ Heulandite Subgroup | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
| Al | ⓘ Anorthite var. Labradorite | (Ca,Na)[Al(Al,Si)Si2O8] |
| Al | ⓘ Montmorillonite | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
| Al | ⓘ Natrolite | Na2Al2Si3O10 · 2H2O |
| Al | ⓘ Orthoclase | K(AlSi3O8) |
| Al | ⓘ Prehnite | Ca2Al2Si3O10(OH)2 |
| Al | ⓘ Scolecite | CaAl2Si3O10 · 3H2O |
| Al | ⓘ Stilbite Subgroup | M6-7[Al8-9Si27-28O72] · nH2O |
| Al | ⓘ Stilbite-Ca | NaCa4(Si27Al9)O72 · 28H2O |
| Al | ⓘ Hornblende Root Name Group | ◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2 |
| Si | Silicon | |
| Si | ⓘ K Feldspar var. Adularia | KAlSi3O8 |
| Si | ⓘ Analcime | Na(AlSi2O6) · H2O |
| Si | ⓘ Anorthite | Ca(Al2Si2O8) |
| Si | ⓘ Enstatite | Mg2Si2O6 |
| Si | ⓘ Gyrolite | NaCa16Si23AlO60(OH)8 · 14H2O |
| Si | ⓘ Heulandite Subgroup | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
| Si | ⓘ Anorthite var. Labradorite | (Ca,Na)[Al(Al,Si)Si2O8] |
| Si | ⓘ Montmorillonite | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
| Si | ⓘ Natrolite | Na2Al2Si3O10 · 2H2O |
| Si | ⓘ Orthoclase | K(AlSi3O8) |
| Si | ⓘ Pectolite | NaCa2Si3O8(OH) |
| Si | ⓘ Prehnite | Ca2Al2Si3O10(OH)2 |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Scolecite | CaAl2Si3O10 · 3H2O |
| Si | ⓘ Stevensite | (Ca,Na)xMg3-x(Si4O10)(OH)2 |
| Si | ⓘ Stilbite Subgroup | M6-7[Al8-9Si27-28O72] · nH2O |
| Si | ⓘ Kerolite | (Mg,Ni)3Si4O10(OH)2 · nH2O (n ~ 1) |
| Si | ⓘ Stilbite-Ca | NaCa4(Si27Al9)O72 · 28H2O |
| Si | ⓘ Hornblende Root Name Group | ◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2 |
| S | Sulfur | |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Chalcocite | Cu2S |
| S | ⓘ Djurleite | Cu31S16 |
| S | ⓘ Galena | PbS |
| S | ⓘ Marcasite | FeS2 |
| Cl | Chlorine | |
| Cl | ⓘ Hornblende Root Name Group | ◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2 |
| K | Potassium | |
| K | ⓘ K Feldspar var. Adularia | KAlSi3O8 |
| K | ⓘ Heulandite Subgroup | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
| K | ⓘ Orthoclase | K(AlSi3O8) |
| Ca | Calcium | |
| Ca | ⓘ Anorthite | Ca(Al2Si2O8) |
| Ca | ⓘ Calcite | CaCO3 |
| Ca | ⓘ Gyrolite | NaCa16Si23AlO60(OH)8 · 14H2O |
| Ca | ⓘ Heulandite Subgroup | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
| Ca | ⓘ Anorthite var. Labradorite | (Ca,Na)[Al(Al,Si)Si2O8] |
| Ca | ⓘ Montmorillonite | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
| Ca | ⓘ Pectolite | NaCa2Si3O8(OH) |
| Ca | ⓘ Prehnite | Ca2Al2Si3O10(OH)2 |
| Ca | ⓘ Scolecite | CaAl2Si3O10 · 3H2O |
| Ca | ⓘ Stevensite | (Ca,Na)xMg3-x(Si4O10)(OH)2 |
| Ca | ⓘ Stilbite-Ca | NaCa4(Si27Al9)O72 · 28H2O |
| Ca | ⓘ Hornblende Root Name Group | ◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2 |
| V | Vanadium | |
| V | ⓘ Mottramite | PbCu(VO4)(OH) |
| V | ⓘ Volborthite | Cu3(V2O7)(OH)2 · 2H2O |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Magnetite | Fe2+Fe23+O4 |
| Fe | ⓘ Marcasite | FeS2 |
| Ni | Nickel | |
| Ni | ⓘ Kerolite | (Mg,Ni)3Si4O10(OH)2 · nH2O (n ~ 1) |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Cu | ⓘ Chalcocite | Cu2S |
| Cu | ⓘ Cuprite var. Chalcotrichite | Cu2O |
| Cu | ⓘ Cuprite | Cu2O |
| Cu | ⓘ Djurleite | Cu31S16 |
| Cu | ⓘ Mottramite | PbCu(VO4)(OH) |
| Cu | ⓘ Volborthite | Cu3(V2O7)(OH)2 · 2H2O |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
| Pb | ⓘ Mottramite | PbCu(VO4)(OH) |
Geochronology
| Geologic Time | Rocks, Minerals and Events | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Phanerozoic | ||||||||||||||||||||||
| Paleozoic | ||||||||||||||||||||||
| Permian | ||||||||||||||||||||||
| Guadalupian |
| |||||||||||||||||||||
| Cisuralian |
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Other Regions, Features and Areas containing this locality
British and Irish IslesGroup of Islands
Eurasian PlateTectonic Plate
- Saxo-Thuringian BeltOrogenic Belt
UK
- England
- Cornwall
- Lizard ComplexComplex
- Lizard PeninsulaPeninsula
- Cornwall
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References
Seager, A.F. (1969) Zeolites and other minerals from Dean quarry, the Lizard, Cornwall. Mineralogical Magazine, 37 (285) 147-148 doi:10.1180/minmag.1969.037.285.18
Dean Quarry, St Keverne, Cornwall, England, UK