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Hugo Mine, Keystone, Keystone District, Pennington Co., South Dakota, USAi
Regional Level Types
Hugo MineMine
Keystone- not defined -
Keystone DistrictMining District
Pennington Co.County
South DakotaState
USACountry

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Key
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Latitude & Longitude (WGS84): 43° 52' 16'' North , 103° 25' 30'' West
Latitude & Longitude (decimal): 43.87111,-103.42500
GeoHash:G#: 9xy3wd2pw
Locality type:Mine
Köppen climate type:BSk : Cold semi-arid (steppe) climate
Nearest Settlements:
PlacePopulationDistance
Keystone343 (2017)2.8km
Hill City995 (2017)13.8km
Colonial Pine Hills2,493 (2017)17.5km
Custer1,952 (2017)18.1km
Hermosa392 (2017)19.1km


A potassic feldspar mine in pegmatite located in the NE¼ sec. 17, T.2S., R.6E., one mile SSW of Keystone.

Mineralization is an irregular, zoned pegmatite body in quartz-mica-staurolite schist.

Workings include open pits, glory holes and underground development.

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


39 valid minerals. 1 (TL) - type locality of valid minerals.

Detailed Mineral List:

Actinolite
Formula: ☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Reference: USGS Prof Paper 297B
Albite
Formula: Na(AlSi3O8)
Reference: R&M 75:3 pp 156-169; USGS Prof Paper 297B
Albite var: Cleavelandite
Formula: Na(AlSi3O8)
Description: Occurs in pegmatite.
Reference: Rocks & Min.:10:147.; USGS Prof Paper 297B
'Albite-Anorthite Series'
Reference: USGS Prof Paper 297B
Almandine
Formula: Fe2+3Al2(SiO4)3
Reference: R&M 75:3 pp 156-169
Amblygonite
Formula: LiAl(PO4)F
Reference: R&M 75:3 pp 156-169; Meeves, H., et al (1966), Reconnaissance of beryllium-bearing pegmatite deposits in six western states, US Bur. Mines Info. Circ. 8298: 32 (Table A-1).; USGS Prof Paper 297B
Arsenopyrite
Formula: FeAsS
Reference: R&M 75:3 pp 156-169
Augelite
Formula: Al2(PO4)(OH)3
Description: Occurs in pegmatite.
Reference: Rocks & Min.:60:110,112 & 116.
Beryl
Formula: Be3Al2(Si6O18)
Description: Occurs in pegmatite.
Reference: Rocks & Min.:60:110,112 & 116; Meeves, H., et al (1966), Reconnaissance of beryllium-bearing pegmatite deposits in six western states, US Bur. Mines Info. Circ. 8298: 32 (Table A-1).; USGS Prof Paper 297B
Cassiterite
Formula: SnO2
Description: Occurs in pegmatite.
Reference: Rocks & Min.:60:110,112 & 116; Meeves, H., et al (1966), Reconnaissance of beryllium-bearing pegmatite deposits in six western states, US Bur. Mines Info. Circ. 8298: 32 (Table A-1).; USGS Prof Paper 297B
Černýite (TL)
Formula: Cu2(Cd,Zn,Fe)SnS4
Type Locality:
Reference: Canadian Mineralogist(1978) 16, 139-146; Am Min 64:653
Childrenite
Formula: Fe2+Al(PO4)(OH)2 · H2O
Reference: R&M 75:3 pp 156-169
'Columbite-Tantalite'
Description: Occurs in pegmatite.
Reference: Rocks & Min.:60:110,112 & 116.; USGS Prof Paper 297B
Crandallite
Formula: CaAl3(PO4)(PO3OH)(OH)6
Reference: R&M 75:3 pp 156-169
Diopside
Formula: CaMgSi2O6
Reference: USGS Prof Paper 297B
Dufrénite
Formula: Ca0.5Fe2+Fe3+5(PO4)4(OH)6 · 2H2O
Reference: USGS Prof Paper 297B
Eosphorite
Formula: Mn2+Al(PO4)(OH)2 · H2O
Reference: R&M 75:3 pp 156-169
Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Reference: USGS Prof Paper 297B
Fluorapatite
Formula: Ca5(PO4)3F
Reference: R&M 75:3 pp 156-169; Meeves, H., et al (1966), Reconnaissance of beryllium-bearing pegmatite deposits in six western states, US Bur. Mines Info. Circ. 8298: 32 (Table A-1).; USGS Prof Paper 297B
Fluorapatite var: Mn-bearing Fluorapatite
Formula: (Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
Description: The manganoan variety. Occurs in pegmatite.
Reference: Rocks & Min.:60:110,112,116.
'Garnet Group'
Formula: X3Z2(SiO4)3
Reference: USGS Prof Paper 297B
Goyazite ?
Formula: SrAl3(PO4)(PO3OH)(OH)6
Reference: R&M 75:3 pp 156-169
'Halloysite'
Formula: Al2(Si2O5)(OH)4
Reference: R&M 75:3 pp 156-169
Heterosite
Formula: (Fe3+,Mn3+)PO4
Reference: R&M 75:3 pp 156-169; USGS Prof Paper 297B
'Indicolite'
Formula: A(D3)G6(T6O18)(BO3)3X3Z
Reference: Rob Lavinsky specimens
Kësterite
Formula: Cu2ZnSnS4
Description: Occurs in pegmatite.
Reference: Rocks & Min.:60:110,112 & 116.
'Lepidolite'
Reference: R&M 75:3 pp 156-169; Meeves, H., et al (1966), Reconnaissance of beryllium-bearing pegmatite deposits in six western states, US Bur. Mines Info. Circ. 8298: 32 (Table A-1).
Löllingite
Formula: FeAs2
Reference: R&M 75:3 pp 156-169
Microcline
Formula: K(AlSi3O8)
Description: Occurs in pegmatite.
Reference: Rocks & Min.:10:147.; USGS Prof Paper 297B
Montebrasite
Formula: LiAl(PO4)(OH)
Description: Occurs in pegmatite.
Reference: Rocks & Min.:60:110,112 & 116.
Montmorillonite
Formula: (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Reference: R&M 75:3 pp 156-169
Morinite
Formula: NaCa2Al2(PO4)2(OH)F4 · 2H2O
Description: Occurs in pegmatite.
Reference: Rocks & Min.:60:110,112 & 116.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Description: Occurs in pegmatite.
Reference: Rocks & Min.:10:147.; USGS Prof Paper 297B
Orthoclase
Formula: K(AlSi3O8)
Description: Occurs in pegmatite.
Reference: Rocks & Min.:10:147.; USGS Prof Paper 297B
Pharmacosiderite
Formula: KFe3+4(AsO4)3(OH)4 · 6-7H2O
Reference: R&M 75:3 pp 156-169
Quartz
Formula: SiO2
Reference: R&M 75:3 pp 156-169; USGS Prof Paper 297B
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Description: Occurs in pegmatite.
Reference: Rocks & Min.:10:147.; USGS Prof Paper 297B
Scorodite
Formula: Fe3+AsO4 · 2H2O
Reference: R&M 75:3 pp 156-169
Sicklerite
Formula: Li1-x(Mn3+xMn2+1-x)PO4
Reference: Rocks & Minerals: 75(3): 156-169.
Sillimanite
Formula: Al2(SiO4)O
Reference: USGS Prof Paper 297B
Spodumene
Formula: LiAlSi2O6
Reference: R&M 75:3 pp 156-169; Meeves, H., et al (1966), Reconnaissance of beryllium-bearing pegmatite deposits in six western states, US Bur. Mines Info. Circ. 8298: 32 (Table A-1).; USGS Prof Paper 297B
Staurolite
Formula: Fe2+2Al9Si4O23(OH)
Reference: USGS Prof Paper 297B
'Tourmaline'
Formula: A(D3)G6(T6O18)(BO3)3X3Z
Reference: Rob Lavinsky specimens
Triphylite
Formula: LiFe2+PO4
Description: Occurs in pegmatite.
Reference: Rocks & Min.:60:110,112 & 116.; USGS Prof Paper 297B
Triplite
Formula: (Mn2+,Fe2+)2(PO4)(F,OH)
Reference: R&M 75:3 pp 156-169
Uraninite
Formula: UO2
Description: Occurs in pegmatite.
Reference: Rocks & Min.:60:110,112 & 116.
Varlamoffite
Formula: (Sn,Fe)(O,OH)2
Description: Decomposition product of stannite-group minerals.
Reference: John R. Ydren collection
Wardite
Formula: NaAl3(PO4)2(OH)4 · 2H2O
Description: Occurs in pegmatite.
Reference: Rocks & Min.:60:110,112 & 116.
'Zinnwaldite' ?
Reference: R&M 75:3 pp 156-169; USGS Prof Paper 297B

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Arsenopyrite2.EB.20FeAsS
Kësterite 2.CB.15aCu2ZnSnS4
Löllingite2.EB.15aFeAs2
Černýite (TL)2.CB.15aCu2(Cd,Zn,Fe)SnS4
Group 4 - Oxides and Hydroxides
Cassiterite4.DB.05SnO2
Quartz4.DA.05SiO2
Uraninite4.DL.05UO2
Varlamoffite4.DB.05(Sn,Fe)(O,OH)2
Group 8 - Phosphates, Arsenates and Vanadates
Amblygonite8.BB.05LiAl(PO4)F
Augelite8.BE.05Al2(PO4)(OH)3
Childrenite8.DD.20Fe2+Al(PO4)(OH)2 · H2O
Crandallite8.BL.10CaAl3(PO4)(PO3OH)(OH)6
Dufrénite8.DK.15Ca0.5Fe2+Fe3+5(PO4)4(OH)6 · 2H2O
Eosphorite8.DD.20Mn2+Al(PO4)(OH)2 · H2O
Fluorapatite8.BN.05Ca5(PO4)3F
var: Mn-bearing Fluorapatite8.BN.05(Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
Goyazite ?8.BL.10SrAl3(PO4)(PO3OH)(OH)6
Heterosite8.AB.10(Fe3+,Mn3+)PO4
Montebrasite8.BB.05LiAl(PO4)(OH)
Morinite8.DM.05NaCa2Al2(PO4)2(OH)F4 · 2H2O
Pharmacosiderite8.DK.10KFe3+4(AsO4)3(OH)4 · 6-7H2O
Scorodite8.CD.10Fe3+AsO4 · 2H2O
Sicklerite8.AB.10Li1-x(Mn3+xMn2+1-x)PO4
Triphylite8.AB.10LiFe2+PO4
Triplite8.BB.10(Mn2+,Fe2+)2(PO4)(F,OH)
Wardite8.DL.10NaAl3(PO4)2(OH)4 · 2H2O
Group 9 - Silicates
Actinolite9.DE.10☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Albite9.FA.35Na(AlSi3O8)
var: Cleavelandite9.FA.35Na(AlSi3O8)
Almandine9.AD.25Fe2+3Al2(SiO4)3
Beryl9.CJ.05Be3Al2(Si6O18)
Diopside9.DA.15CaMgSi2O6
Epidote9.BG.05a{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
'Halloysite'9.ED.10Al2(Si2O5)(OH)4
Microcline9.FA.30K(AlSi3O8)
Montmorillonite9.EC.40(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
Orthoclase9.FA.30K(AlSi3O8)
Schorl9.CK.05Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Sillimanite9.AF.05Al2(SiO4)O
Spodumene9.DA.30LiAlSi2O6
Staurolite9.AF.30Fe2+2Al9Si4O23(OH)
Unclassified Minerals, Rocks, etc.
'Albite-Anorthite Series'-
'Columbite-Tantalite'-
'Garnet Group'-X3Z2(SiO4)3
'Indicolite'-A(D3)G6(T6O18)(BO3)3X3Z
'Lepidolite'-
'Tourmaline'-A(D3)G6(T6O18)(BO3)3X3Z
'Zinnwaldite' ?-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:1
Kësterite 2.9.2.9Cu2ZnSnS4
Černýite (TL)2.9.2.2Cu2(Cd,Zn,Fe)SnS4
AmBnXp, with (m+n):p = 1:2
Arsenopyrite2.12.4.1FeAsS
Löllingite2.12.2.9FeAs2
Group 4 - SIMPLE OXIDES
AX2
Cassiterite4.4.1.5SnO2
Varlamoffite4.4.2.1(Sn,Fe)(O,OH)2
Group 5 - OXIDES CONTAINING URANIUM OR THORIUM
AXO2·xH2O
Uraninite5.1.1.1UO2
Group 38 - ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
ABXO4
Sicklerite38.1.4.2Li1-x(Mn3+xMn2+1-x)PO4
Triphylite38.1.1.1LiFe2+PO4
AXO4
Heterosite38.4.1.1(Fe3+,Mn3+)PO4
Group 40 - HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
(AB)5(XO4)2·xH2O
Scorodite40.4.1.3Fe3+AsO4 · 2H2O
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
(AB)2(XO4)Zq
Amblygonite41.5.8.1LiAl(PO4)F
Montebrasite41.5.8.2LiAl(PO4)(OH)
A2(XO4)Zq
Augelite41.6.8.1Al2(PO4)(OH)3
Triplite41.6.1.2(Mn2+,Fe2+)2(PO4)(F,OH)
A5(XO4)3Zq
Fluorapatite41.8.1.1Ca5(PO4)3F
Group 42 - HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
(AB)5(XO4)2Zq·xH2O
Morinite42.4.2.1NaCa2Al2(PO4)2(OH)F4 · 2H2O
(AB)2(XO4)Zq·xH2O
Childrenite42.7.1.1Fe2+Al(PO4)(OH)2 · H2O
Crandallite42.7.3.1CaAl3(PO4)(PO3OH)(OH)6
Eosphorite42.7.1.2Mn2+Al(PO4)(OH)2 · H2O
Goyazite ?42.7.3.3SrAl3(PO4)(PO3OH)(OH)6
Wardite42.7.8.2NaAl3(PO4)2(OH)4 · 2H2O
(AB)5(XO4)3Zq·xH2O
Pharmacosiderite42.8.1a.1KFe3+4(AsO4)3(OH)4 · 6-7H2O
(AB)7(XO4)4Zq·xH2O
Dufrénite42.9.1.2Ca0.5Fe2+Fe3+5(PO4)4(OH)6 · 2H2O
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Almandine51.4.3a.2Fe2+3Al2(SiO4)3
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [4] and >[4] coordination
Sillimanite52.2.2a.1Al2(SiO4)O
Staurolite52.2.3.1Fe2+2Al9Si4O23(OH)
Group 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
Epidote58.2.1a.7{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Beryl61.1.1.1Be3Al2(Si6O18)
Six-Membered Rings with borate groups
Schorl61.3.1.10Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Diopside65.1.3a.1CaMgSi2O6
Spodumene65.1.4.1LiAlSi2O6
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 1:1 layers
'Halloysite'71.1.1.4Al2(Si2O5)(OH)4
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Sheets of 6-membered rings with 2:1 clays
Montmorillonite71.3.1a.2(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Microcline76.1.1.5K(AlSi3O8)
Orthoclase76.1.1.1K(AlSi3O8)
Unclassified Minerals, Mixtures, etc.
Actinolite-☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Albite
var: Cleavelandite
-Na(AlSi3O8)
'Albite-Anorthite Series'-
'Columbite-Tantalite'-
Fluorapatite
var: Mn-bearing Fluorapatite
-(Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
'Garnet Group'-X3Z2(SiO4)3
'Indicolite'-A(D3)G6(T6O18)(BO3)3X3Z
'Lepidolite'-
'Tourmaline'-A(D3)G6(T6O18)(BO3)3X3Z
'Zinnwaldite' ?-

List of minerals for each chemical element

HHydrogen
H AugeliteAl2(PO4)(OH)3
H MoriniteNaCa2Al2(PO4)2(OH)F4 · 2H2O
H MontebrasiteLiAl(PO4)(OH)
H WarditeNaAl3(PO4)2(OH)4 · 2H2O
H Fluorapatite (var: Mn-bearing Fluorapatite)(Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
H SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
H MuscoviteKAl2(AlSi3O10)(OH)2
H ChildreniteFe2+Al(PO4)(OH)2 · H2O
H CrandalliteCaAl3(PO4)(PO3OH)(OH)6
H EosphoriteMn2+Al(PO4)(OH)2 · H2O
H Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
H PharmacosideriteKFe43+(AsO4)3(OH)4 · 6-7H2O
H ScoroditeFe3+AsO4 · 2H2O
H Triplite(Mn2+,Fe2+)2(PO4)(F,OH)
H HalloysiteAl2(Si2O5)(OH)4
H Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
H StauroliteFe22+Al9Si4O23(OH)
H DufréniteCa0.5Fe2+Fe53+(PO4)4(OH)6 · 2H2O
H Varlamoffite(Sn,Fe)(O,OH)2
H GoyaziteSrAl3(PO4)(PO3OH)(OH)6
LiLithium
Li MontebrasiteLiAl(PO4)(OH)
Li TriphyliteLiFe2+PO4
Li AmblygoniteLiAl(PO4)F
Li SickleriteLi1-x(Mnx3+Mn2+1-x)PO4
Li SpodumeneLiAlSi2O6
BeBeryllium
Be BerylBe3Al2(Si6O18)
BBoron
B SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
B IndicoliteA(D3)G6(T6O18)(BO3)3X3Z
B TourmalineA(D3)G6(T6O18)(BO3)3X3Z
OOxygen
O CassiteriteSnO2
O BerylBe3Al2(Si6O18)
O AugeliteAl2(PO4)(OH)3
O MoriniteNaCa2Al2(PO4)2(OH)F4 · 2H2O
O MontebrasiteLiAl(PO4)(OH)
O WarditeNaAl3(PO4)2(OH)4 · 2H2O
O TriphyliteLiFe2+PO4
O UraniniteUO2
O Fluorapatite (var: Mn-bearing Fluorapatite)(Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
O SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
O OrthoclaseK(AlSi3O8)
O MicroclineK(AlSi3O8)
O Albite (var: Cleavelandite)Na(AlSi3O8)
O MuscoviteKAl2(AlSi3O10)(OH)2
O AlbiteNa(AlSi3O8)
O AlmandineFe32+Al2(SiO4)3
O AmblygoniteLiAl(PO4)F
O ChildreniteFe2+Al(PO4)(OH)2 · H2O
O CrandalliteCaAl3(PO4)(PO3OH)(OH)6
O EosphoriteMn2+Al(PO4)(OH)2 · H2O
O FluorapatiteCa5(PO4)3F
O Heterosite(Fe3+,Mn3+)PO4
O Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
O PharmacosideriteKFe43+(AsO4)3(OH)4 · 6-7H2O
O QuartzSiO2
O ScoroditeFe3+AsO4 · 2H2O
O SickleriteLi1-x(Mnx3+Mn2+1-x)PO4
O SpodumeneLiAlSi2O6
O Triplite(Mn2+,Fe2+)2(PO4)(F,OH)
O HalloysiteAl2(Si2O5)(OH)4
O Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
O DiopsideCaMgSi2O6
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O Garnet GroupX3Z2(SiO4)3
O StauroliteFe22+Al9Si4O23(OH)
O SillimaniteAl2(SiO4)O
O DufréniteCa0.5Fe2+Fe53+(PO4)4(OH)6 · 2H2O
O IndicoliteA(D3)G6(T6O18)(BO3)3X3Z
O Varlamoffite(Sn,Fe)(O,OH)2
O TourmalineA(D3)G6(T6O18)(BO3)3X3Z
O GoyaziteSrAl3(PO4)(PO3OH)(OH)6
FFluorine
F MoriniteNaCa2Al2(PO4)2(OH)F4 · 2H2O
F Fluorapatite (var: Mn-bearing Fluorapatite)(Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
F AmblygoniteLiAl(PO4)F
F FluorapatiteCa5(PO4)3F
F Triplite(Mn2+,Fe2+)2(PO4)(F,OH)
NaSodium
Na MoriniteNaCa2Al2(PO4)2(OH)F4 · 2H2O
Na WarditeNaAl3(PO4)2(OH)4 · 2H2O
Na SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Na Albite (var: Cleavelandite)Na(AlSi3O8)
Na AlbiteNa(AlSi3O8)
Na Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
MgMagnesium
Mg Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Mg Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Mg DiopsideCaMgSi2O6
AlAluminium
Al BerylBe3Al2(Si6O18)
Al AugeliteAl2(PO4)(OH)3
Al MoriniteNaCa2Al2(PO4)2(OH)F4 · 2H2O
Al MontebrasiteLiAl(PO4)(OH)
Al WarditeNaAl3(PO4)2(OH)4 · 2H2O
Al SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Al OrthoclaseK(AlSi3O8)
Al MicroclineK(AlSi3O8)
Al Albite (var: Cleavelandite)Na(AlSi3O8)
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al AlbiteNa(AlSi3O8)
Al AlmandineFe32+Al2(SiO4)3
Al AmblygoniteLiAl(PO4)F
Al ChildreniteFe2+Al(PO4)(OH)2 · H2O
Al CrandalliteCaAl3(PO4)(PO3OH)(OH)6
Al EosphoriteMn2+Al(PO4)(OH)2 · H2O
Al Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Al SpodumeneLiAlSi2O6
Al HalloysiteAl2(Si2O5)(OH)4
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Al StauroliteFe22+Al9Si4O23(OH)
Al SillimaniteAl2(SiO4)O
Al GoyaziteSrAl3(PO4)(PO3OH)(OH)6
SiSilicon
Si BerylBe3Al2(Si6O18)
Si SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Si OrthoclaseK(AlSi3O8)
Si MicroclineK(AlSi3O8)
Si Albite (var: Cleavelandite)Na(AlSi3O8)
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si AlbiteNa(AlSi3O8)
Si AlmandineFe32+Al2(SiO4)3
Si Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Si QuartzSiO2
Si SpodumeneLiAlSi2O6
Si HalloysiteAl2(Si2O5)(OH)4
Si Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Si DiopsideCaMgSi2O6
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Si Garnet GroupX3Z2(SiO4)3
Si StauroliteFe22+Al9Si4O23(OH)
Si SillimaniteAl2(SiO4)O
PPhosphorus
P AugeliteAl2(PO4)(OH)3
P MoriniteNaCa2Al2(PO4)2(OH)F4 · 2H2O
P MontebrasiteLiAl(PO4)(OH)
P WarditeNaAl3(PO4)2(OH)4 · 2H2O
P TriphyliteLiFe2+PO4
P Fluorapatite (var: Mn-bearing Fluorapatite)(Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
P AmblygoniteLiAl(PO4)F
P ChildreniteFe2+Al(PO4)(OH)2 · H2O
P CrandalliteCaAl3(PO4)(PO3OH)(OH)6
P EosphoriteMn2+Al(PO4)(OH)2 · H2O
P FluorapatiteCa5(PO4)3F
P Heterosite(Fe3+,Mn3+)PO4
P SickleriteLi1-x(Mnx3+Mn2+1-x)PO4
P Triplite(Mn2+,Fe2+)2(PO4)(F,OH)
P DufréniteCa0.5Fe2+Fe53+(PO4)4(OH)6 · 2H2O
P GoyaziteSrAl3(PO4)(PO3OH)(OH)6
SSulfur
S ČernýiteCu2(Cd,Zn,Fe)SnS4
S Kësterite Cu2ZnSnS4
S ArsenopyriteFeAsS
ClChlorine
Cl Fluorapatite (var: Mn-bearing Fluorapatite)(Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
KPotassium
K OrthoclaseK(AlSi3O8)
K MicroclineK(AlSi3O8)
K MuscoviteKAl2(AlSi3O10)(OH)2
K PharmacosideriteKFe43+(AsO4)3(OH)4 · 6-7H2O
CaCalcium
Ca MoriniteNaCa2Al2(PO4)2(OH)F4 · 2H2O
Ca Fluorapatite (var: Mn-bearing Fluorapatite)(Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
Ca CrandalliteCaAl3(PO4)(PO3OH)(OH)6
Ca FluorapatiteCa5(PO4)3F
Ca Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Ca Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Ca DiopsideCaMgSi2O6
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Ca DufréniteCa0.5Fe2+Fe53+(PO4)4(OH)6 · 2H2O
MnManganese
Mn Fluorapatite (var: Mn-bearing Fluorapatite)(Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
Mn EosphoriteMn2+Al(PO4)(OH)2 · H2O
Mn Heterosite(Fe3+,Mn3+)PO4
Mn SickleriteLi1-x(Mnx3+Mn2+1-x)PO4
Mn Triplite(Mn2+,Fe2+)2(PO4)(F,OH)
FeIron
Fe ČernýiteCu2(Cd,Zn,Fe)SnS4
Fe TriphyliteLiFe2+PO4
Fe SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Fe AlmandineFe32+Al2(SiO4)3
Fe ArsenopyriteFeAsS
Fe ChildreniteFe2+Al(PO4)(OH)2 · H2O
Fe Heterosite(Fe3+,Mn3+)PO4
Fe LöllingiteFeAs2
Fe PharmacosideriteKFe43+(AsO4)3(OH)4 · 6-7H2O
Fe ScoroditeFe3+AsO4 · 2H2O
Fe Triplite(Mn2+,Fe2+)2(PO4)(F,OH)
Fe Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe StauroliteFe22+Al9Si4O23(OH)
Fe DufréniteCa0.5Fe2+Fe53+(PO4)4(OH)6 · 2H2O
Fe Varlamoffite(Sn,Fe)(O,OH)2
CuCopper
Cu ČernýiteCu2(Cd,Zn,Fe)SnS4
Cu Kësterite Cu2ZnSnS4
ZnZinc
Zn ČernýiteCu2(Cd,Zn,Fe)SnS4
Zn Kësterite Cu2ZnSnS4
AsArsenic
As ArsenopyriteFeAsS
As LöllingiteFeAs2
As PharmacosideriteKFe43+(AsO4)3(OH)4 · 6-7H2O
As ScoroditeFe3+AsO4 · 2H2O
SrStrontium
Sr GoyaziteSrAl3(PO4)(PO3OH)(OH)6
CdCadmium
Cd ČernýiteCu2(Cd,Zn,Fe)SnS4
SnTin
Sn ČernýiteCu2(Cd,Zn,Fe)SnS4
Sn Kësterite Cu2ZnSnS4
Sn CassiteriteSnO2
Sn Varlamoffite(Sn,Fe)(O,OH)2
UUranium
U UraniniteUO2

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Paleoproterozoic
1600 - 2500 Ma



ID: 2476532
Harney Peak Granite

Age: Proterozoic (1600 - 2500 Ma)

Stratigraphic Name: Harney Peak Granite

Description: Layered granite, pegmatitic granite, and pegmatite. Leucocratic, peraluminous, plagioclase-microcline-quartz-muscovite S-type granite. Tourmaline and biotite common, but biotite mainly in inner part of central mass. Central mass consists of hundreds of intrusions. More than 24,000 separate bodies of pegmatite and granite are known between the central mass and the line defining the outer limit of pegmatite and granite bodies. Several hundred zoned pegmatites in a peripheral zone contain deposits of feldspar, mica, beryl, and other rare-element minerals. Emplacement age of 1,715 ± 3 Ma for the main granite based on concordant U-Pb date for monazite (Redden and others, 1990), but the emplacement of some pegmatite bodies may have continued for ~10 million years.

Reference: Redden, J.A., E. DeWitt. Maps Showing Geology, Structure, and Geophysics of the Central Black Hills, South Dakota. U.S. Geological Survey Scientific Investigations Map 2777. [73]

Paleoproterozoic
1600 - 2500 Ma



ID: 2797792
Metagraywacke

Age: Proterozoic (1600 - 2500 Ma)

Description: Light- to dark-gray, silceous mica schist and impure quartzite. Differentiated where possible into three primary tongues or lenses. (Xgw1, Xgw2, and Xgw3) Thickness from 1,000 ft to over 5,000 ft (305-1,524 m).

Comments: Original map source: Martin, J.E., Sawyer, J.F., Fahrenbach, M.D., Tomhave, D.W., and Schulz, L.D., 2004, Geologic Map of South Dakota: South Dakota Geological Survey, GM 10, scale 1:500,000.

Lithology: Major:{mica schist,quartzite}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Paleoproterozoic
1600 - 2500 Ma



ID: 3191707
Paleoproterozoic intrusive rocks

Age: Proterozoic (1600 - 2500 Ma)

Lithology: Intrusive igneous rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Rocks & Minerals: 10:147; 60:110,112 & 116; Rocks and Minerals 75:3 pp 156-169;
Meeves, H., et al (1966), Reconnaissance of beryllium-bearing pegmatite deposits in six western states, US Bur. Mines Info. Circ. 8298: 32 (Table A-1).
Norton, J. J.; Page, L. R.; Brobst, D. A. (1962) Geology of the Hugo pegmatite, Keystone, South Dakota. USGS Prof Paper 297B


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