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Skillion Hill, Clarence city, Tasmania, Australiai
Regional Level Types
Skillion HillHill
Clarence cityCity
TasmaniaState
AustraliaCountry

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PhotosMapsSearch
06697380017272418044725.jpg
Scoria, etc.

Skillion Hill, Clarence city, Tasmania, Australia
08694960017271953894486.jpg
Buchite, etc.

Skillion Hill, Clarence city, Tasmania, Australia
02442190017272418057343.jpg
Basalt, etc.

Skillion Hill, Clarence city, Tasmania, Australia
08112080017271953161384.jpg
Scoria, etc.

Skillion Hill, Clarence city, Tasmania, Australia
08694960017271953894486.jpg
Buchite, etc.

Skillion Hill, Clarence city, Tasmania, Australia
02442190017272418057343.jpg
Basalt, etc.

Skillion Hill, Clarence city, Tasmania, Australia
08112080017271953161384.jpg
Scoria, etc.

Skillion Hill, Clarence city, Tasmania, Australia
06048370017271953908003.jpg
Buchite, etc.

Skillion Hill, Clarence city, Tasmania, Australia
Latitude & Longitude (WGS84):
42° 53' 23'' South , 147° 25' 34'' East
Latitude & Longitude (decimal):
-42.88994,147.42613
GeoHash:
G#: r22u4b0kj
GRN:
S29E78
Type:
Hill
Köppen climate type:
Cfb : Temperate oceanic climate
Nearest Settlements:
PlacePopulationDistance
Howrah7,888 (2015)1.7km
Rokeby3,026 (2015)2.1km
Bellerive4,316 (2015)4.8km
Acton Park2,129 (2015)4.9km
Warrane2,197 (2015)5.2km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
Mineralogical Society of TasmaniaROSNY PARK, Tasmania5km
The Lapidary Club of Tasmania Inc.Hobart, Tasmania8km
Mindat Locality ID:
411757
Long-form identifier:
mindat:1:2:411757:8
GUID (UUID V4):
0


A hill containing basalt outcrops.
These rocks comprise a range of basaltic rocks with textures ranging from lavas to scoria and pyroclastics. Some show probable welded lapilli, indicating welded basaltic tuffs. The scorias blocks and bombs are sometimes welded into blocky, autoclastic basaltic breccias.
The rock chemistry is strongly peralkaline and indicates a trachybasalt, specifically a hawaiite assuming the Na/K ratios are reasonably pristine. No nepheline was identified, probably due to the alteration and weathering.
The mineralogy of the basalts was mostly Na-Ca plagioclase - augite - olivine - magnetite - ilmenite, but most olivine is now altered to iddingsite, and hematite, clays (halloysite, smectite and kaolinite, and chalcedony have also formed late. Hematite occurs as a late stage (vapour phase?) mineral with high Ti and Mg contents.
Inclusions in the basalts include orthopyroxene (altering to clinopyroxene), dolerite (slightly altered, with oxidised augites), quartz (altered to tridymite – glass buchites), and aluminous (metasedimentary?) rocks altered to anorthoclase/sanidine – aegirine-augite – tridymite – glass hornfels.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


12 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 Diagram

Detailed Mineral List:

ⓘ Aegirine-augite
Formula: (NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6
ⓘ Albite
Formula: Na(AlSi3O8)
ⓘ Albite var. Anorthoclase
Formula: (Na,K)AlSi3O8
ⓘ Augite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
ⓘ 'Clay minerals'
ⓘ 'Clinopyroxene Subgroup'
ⓘ 'Fayalite-Forsterite Series'
ⓘ Halloysite
Formula: Al2(Si2O5)(OH)4
ⓘ Hematite
Formula: Fe2O3
ⓘ 'Iddingsite'
ⓘ Ilmenite
Formula: Fe2+TiO3
ⓘ Kaolinite
Formula: Al2(Si2O5)(OH)4
ⓘ Magnetite
Formula: Fe2+Fe3+2O4
ⓘ Nepheline
Formula: Na3K(Al4Si4O16)
ⓘ 'Orthopyroxene Subgroup'
ⓘ 'Plagioclase'
Formula: (Na,Ca)[(Si,Al)AlSi2]O8
ⓘ Quartz
Formula: SiO2
ⓘ Quartz var. Chalcedony
Formula: SiO2
ⓘ Sanidine
Formula: K(AlSi3O8)
ⓘ 'Smectite Group'
Formula: A0.3D2-3[T4O10]Z2 · nH2O
ⓘ Tridymite
Formula: SiO2

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘMagnetite4.BB.05Fe2+Fe3+2O4
ⓘHematite4.CB.05Fe2O3
ⓘIlmenite4.CB.05Fe2+TiO3
ⓘQuartz
var. Chalcedony		4.DA.05SiO2
ⓘ4.DA.05SiO2
ⓘTridymite4.DA.10SiO2
Group 9 - Silicates
ⓘAugite9.DA.15(CaxMgyFez)(Mgy1Fez1)Si2O6
ⓘAegirine-augite9.DA.20(NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6
ⓘKaolinite9.ED.05Al2(Si2O5)(OH)4
ⓘHalloysite9.ED.10Al2(Si2O5)(OH)4
ⓘNepheline9.FA.05Na3K(Al4Si4O16)
ⓘSanidine9.FA.30K(AlSi3O8)
ⓘAlbite9.FA.35Na(AlSi3O8)
ⓘvar. Anorthoclase9.FA.35(Na,K)AlSi3O8
Unclassified
ⓘ'Clay minerals'-
ⓘ'Iddingsite'-
ⓘ'Clinopyroxene Subgroup'-
ⓘ'Fayalite-Forsterite Series'-
ⓘ'Plagioclase'-(Na,Ca)[(Si,Al)AlSi2]O8
ⓘ'Orthopyroxene Subgroup'-
ⓘ'Smectite Group'-A0.3D2-3[T4O10]Z2 · nH2O

List of minerals for each chemical element

HHydrogen
Hⓘ HalloysiteAl2(Si2O5)(OH)4
Hⓘ KaoliniteAl2(Si2O5)(OH)4
Hⓘ Smectite GroupA0.3D2-3[T4O10]Z2 · nH2O
OOxygen
Oⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Oⓘ AlbiteNa(AlSi3O8)
Oⓘ Albite var. Anorthoclase(Na,K)AlSi3O8
Oⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Oⓘ Quartz var. ChalcedonySiO2
Oⓘ HalloysiteAl2(Si2O5)(OH)4
Oⓘ HematiteFe2O3
Oⓘ IlmeniteFe2+TiO3
Oⓘ KaoliniteAl2(Si2O5)(OH)4
Oⓘ MagnetiteFe2+Fe23+O4
Oⓘ NephelineNa3K(Al4Si4O16)
Oⓘ QuartzSiO2
Oⓘ SanidineK(AlSi3O8)
Oⓘ TridymiteSiO2
Oⓘ Fayalite-Forsterite Series
Oⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Oⓘ Smectite GroupA0.3D2-3[T4O10]Z2 · nH2O
NaSodium
Naⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Naⓘ AlbiteNa(AlSi3O8)
Naⓘ Albite var. Anorthoclase(Na,K)AlSi3O8
Naⓘ NephelineNa3K(Al4Si4O16)
Naⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
MgMagnesium
Mgⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Mgⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Mgⓘ Fayalite-Forsterite Series
AlAluminium
Alⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Alⓘ AlbiteNa(AlSi3O8)
Alⓘ Albite var. Anorthoclase(Na,K)AlSi3O8
Alⓘ HalloysiteAl2(Si2O5)(OH)4
Alⓘ KaoliniteAl2(Si2O5)(OH)4
Alⓘ NephelineNa3K(Al4Si4O16)
Alⓘ SanidineK(AlSi3O8)
Alⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
SiSilicon
Siⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Siⓘ AlbiteNa(AlSi3O8)
Siⓘ Albite var. Anorthoclase(Na,K)AlSi3O8
Siⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Siⓘ Quartz var. ChalcedonySiO2
Siⓘ HalloysiteAl2(Si2O5)(OH)4
Siⓘ KaoliniteAl2(Si2O5)(OH)4
Siⓘ NephelineNa3K(Al4Si4O16)
Siⓘ QuartzSiO2
Siⓘ SanidineK(AlSi3O8)
Siⓘ TridymiteSiO2
Siⓘ Fayalite-Forsterite Series
Siⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
KPotassium
Kⓘ Albite var. Anorthoclase(Na,K)AlSi3O8
Kⓘ NephelineNa3K(Al4Si4O16)
Kⓘ SanidineK(AlSi3O8)
CaCalcium
Caⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Caⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Caⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
TiTitanium
Tiⓘ IlmeniteFe2+TiO3
FeIron
Feⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Feⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Feⓘ HematiteFe2O3
Feⓘ IlmeniteFe2+TiO3
Feⓘ MagnetiteFe2+Fe23+O4
Feⓘ Fayalite-Forsterite Series

Other Regions, Features and Areas containing this locality

Australia
Australian PlateTectonic Plate

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

Bottrill, R.S. and Unwin, L., (2020) MINERALOGICAL, PETROLOGICAL AND GEOCHEMICAL ANALYSES, SKILLION HILL, ROKEBY. Mineral Resources Tasmania Laboratory Report LJN2018-074
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