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Helen Beryl Mine, Fourmile, Custer Mining District, Custer County, South Dakota, USAi
Regional Level Types
Helen Beryl MineMine
FourmileUnincorporated Community
Custer Mining DistrictMining District
Custer CountyCounty
South DakotaState
USACountry

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Latitude & Longitude (WGS84):
43° 42' 46'' North , 103° 41' 48'' West
Latitude & Longitude (decimal):
Type:
Nearest Settlements:
PlacePopulationDistance
Custer1,952 (2017)9.9km
Pringle109 (2017)14.2km
Hill City995 (2017)26.3km
Keystone343 (2017)30.2km
Hot Springs3,532 (2017)36.0km
Mindat Locality ID:
11785
Long-form identifier:
mindat:1:2:11785:3
GUID (UUID V4):
94aef2ad-e723-4a00-bc29-800d8e61c873
Other/historical names associated with this locality:
Sweepstakes Beryl; Big Tom claim; Kem claim


A beryl mine located in sec. 7, T.4S., R.4E., at Fourmile, SW of Custer. Operated chiefly in the 1940's (WWII).

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

Workings include a large open cut.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


22 valid minerals. 2 erroneous literature entries.

Detailed Mineral List:

β“˜ Albite
Formula: Na(AlSi3O8)
Description: Occurs in pegmatite.
β“˜ Alluaudite
Formula: (Na,Ca)Mn2+(Fe3+,Mn2+,Fe2+,Mg)2(PO4)3
Description: Occurs in pegmatite.
β“˜ Amblygonite
Formula: LiAl(PO4)F
β“˜ Bertrandite
Formula: Be4(Si2O7)(OH)2
Description: Occurs in pegmatite.
β“˜ Beryl
Formula: Be3Al2(Si6O18)
Description: Occurs in pegmatite.
β“˜ 'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
β“˜ Cassiterite
Formula: SnO2
β“˜ Childrenite
Formula: Fe2+Al(PO4)(OH)2 · H2O
β“˜ 'Chlorite Group'
β“˜ 'Columbite-Tantalite'
Description: Occurs in pegmatite.
β“˜ Epidote
Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
β“˜ Eucryptite ?
Formula: LiAlSiO4
β“˜ Fluorapatite
Formula: Ca5(PO4)3F
Description: Occurs in pegmatite.
β“˜ 'Garnet Group'
Formula: X3Z2(SiO4)3
β“˜ Hematite
Formula: Fe2O3
β“˜ Heterosite
Formula: (Fe3+,Mn3+)PO4
β“˜ 'Hornblende Root Name Group'
Formula: ◻Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2
β“˜ 'Ixiolite-(Mn2+)-Ixiolite-(Fe2+) Series'
Formula: (Ta,Nb,Sn,Fe,Mn)4O8
β“˜ 'Jahnsite Group'
Formula: XM1M22M32(H2O)8(OH)2(PO4)4
β“˜ Lithiophilite var. Sicklerite
Formula: Li1-x(Mn3+xMn2+1-x)PO4
β“˜ 'Manganese Oxides'
β“˜ Microcline
Formula: K(AlSi3O8)
Description: Occurs in pegmatite.
β“˜ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Description: Occurs in pegmatite.
β“˜ Muscovite var. Sericite
Formula: KAl2(AlSi3O10)(OH)2
β“˜ Opal
Formula: SiO2 · nH2O
β“˜ Opal var. Opal-AN
Formula: SiO2 · nH2O
Description: Occurs in pegmatite.
β“˜ Purpurite
Formula: Mn3+(PO4)
β“˜ Quartz
Formula: SiO2
Description: Occurs in pegmatite.
β“˜ Schorl
Formula: NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
Description: Occurs in pegmatite.
β“˜ Siderite
Formula: FeCO3
β“˜ Sillimanite
Formula: Al2(SiO4)O
β“˜ Spodumene
Formula: LiAlSi2O6
Description: Occurs in pegmatite.
β“˜ Spodumene var. Hiddenite
Formula: LiAlSi2O6
β“˜ 'Tantalite'
Formula: (Mn,Fe)(Ta,Nb)2O6
β“˜ Triphylite
Formula: LiFe2+PO4
Description: Mn/Mn + Fe = 0.34
β“˜ Triphylite var. Ferrisicklerite
Formula: Li1-x(Fe3+xFe2+1-x)PO4
β“˜ 'Triphylite Group'
Formula: VIM1VIM2TO4
β“˜ Vivianite
Formula: Fe2+Fe2+2(PO4)2 · 8H2O
Description: Occurs in pegmatite.

Gallery:

Be3Al2(Si6O18)β“˜ Beryl
(Fe3+,Mn3+)PO4β“˜ Heterosite
KAl2(AlSi3O10)(OH)2β“˜ Muscovite
LiAlSi2O6β“˜ Spodumene
(Mn,Fe)(Ta,Nb)2O6β“˜ 'Tantalite'

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
β“˜'Ixiolite-(Mn2+)-Ixiolite-(Fe2+) Series'4..(Ta,Nb,Sn,Fe,Mn)4O8
β“˜Hematite4.CB.05Fe2O3
β“˜Quartz4.DA.05SiO2
β“˜Opal4.DA.10SiO2 Β· nH2O
β“˜var. Opal-AN4.DA.10SiO2 Β· nH2O
β“˜Cassiterite4.DB.05SnO2
Group 5 - Nitrates and Carbonates
β“˜Siderite5.AB.05FeCO3
Group 8 - Phosphates, Arsenates and Vanadates
β“˜Lithiophilite
var. Sicklerite ?
8.AB.10Li1-x(Mn3+xMn2+1-x)PO4
β“˜Purpurite ?8.AB.10Mn3+(PO4)
β“˜Triphylite8.AB.10LiFe2+PO4
β“˜Heterosite8.AB.10(Fe3+,Mn3+)PO4
β“˜Triphylite
var. Ferrisicklerite
8.AB.10Li1-x(Fe3+xFe2+1-x)PO4
β“˜Alluaudite8.AC.10(Na,Ca)Mn2+(Fe3+,Mn2+,Fe2+,Mg)2(PO4)3
β“˜Amblygonite8.BB.05LiAl(PO4)F
β“˜Fluorapatite8.BN.05Ca5(PO4)3F
β“˜Vivianite8.CE.40Fe2+Fe2+2(PO4)2 Β· 8H2O
β“˜Childrenite8.DD.20Fe2+Al(PO4)(OH)2 Β· H2O
Group 9 - Silicates
β“˜Eucryptite ?9.AA.05LiAlSiO4
β“˜Sillimanite9.AF.05Al2(SiO4)O
β“˜Bertrandite9.BD.05Be4(Si2O7)(OH)2
β“˜Epidote9.BG.05a(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
β“˜Beryl9.CJ.05Be3Al2(Si6O18)
β“˜Schorl9.CK.05NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
β“˜Spodumene
var. Hiddenite
9.DA.30LiAlSi2O6
β“˜9.DA.30LiAlSi2O6
β“˜Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
β“˜var. Sericite9.EC.15KAl2(AlSi3O10)(OH)2
β“˜Microcline9.FA.30K(AlSi3O8)
β“˜Albite9.FA.35Na(AlSi3O8)
Unclassified
β“˜'Tantalite'-(Mn,Fe)(Ta,Nb)2O6
β“˜'Chlorite Group'-
β“˜'Hornblende Root Name Group'-β—»Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2
β“˜'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
β“˜'Garnet Group'-X3Z2(SiO4)3
β“˜'Columbite-Tantalite'-
β“˜'Manganese Oxides'-
β“˜'Triphylite Group'-VIM1VIM2TO4
β“˜'Jahnsite Group'-XM1M22M32(H2O)8(OH)2(PO4)4

List of minerals for each chemical element

HHydrogen
Hβ“˜ BertranditeBe4(Si2O7)(OH)2
Hβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Hβ“˜ ChildreniteFe2+Al(PO4)(OH)2 · H2O
Hβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Hβ“˜ Opal var. Opal-ANSiO2 · nH2O
Hβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Hβ“˜ OpalSiO2 · nH2O
Hβ“˜ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Hβ“˜ VivianiteFe2+Fe22+(PO4)2 · 8H2O
Hβ“˜ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
Hβ“˜ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
Hβ“˜ Jahnsite GroupXM1M22M32(H2O)8(OH)2(PO4)4
LiLithium
Liβ“˜ AmblygoniteLiAl(PO4)F
Liβ“˜ EucryptiteLiAlSiO4
Liβ“˜ Triphylite var. FerrisickleriteLi1-x(Fex3+Fe2+1-x)PO4
Liβ“˜ Lithiophilite var. SickleriteLi1-x(Mnx3+Mn2+1-x)PO4
Liβ“˜ SpodumeneLiAlSi2O6
Liβ“˜ TriphyliteLiFe2+PO4
Liβ“˜ Spodumene var. HiddeniteLiAlSi2O6
BeBeryllium
Beβ“˜ BertranditeBe4(Si2O7)(OH)2
Beβ“˜ BerylBe3Al2(Si6O18)
BBoron
Bβ“˜ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
CCarbon
Cβ“˜ SideriteFeCO3
OOxygen
Oβ“˜ AlbiteNa(AlSi3O8)
Oβ“˜ Alluaudite(Na,Ca)Mn2+(Fe3+,Mn2+,Fe2+,Mg)2(PO4)3
Oβ“˜ AmblygoniteLiAl(PO4)F
Oβ“˜ BertranditeBe4(Si2O7)(OH)2
Oβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Oβ“˜ BerylBe3Al2(Si6O18)
Oβ“˜ CassiteriteSnO2
Oβ“˜ ChildreniteFe2+Al(PO4)(OH)2 · H2O
Oβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Oβ“˜ EucryptiteLiAlSiO4
Oβ“˜ Triphylite var. FerrisickleriteLi1-x(Fex3+Fe2+1-x)PO4
Oβ“˜ FluorapatiteCa5(PO4)3F
Oβ“˜ HematiteFe2O3
Oβ“˜ Heterosite(Fe3+,Mn3+)PO4
Oβ“˜ Opal var. Opal-ANSiO2 · nH2O
Oβ“˜ MicroclineK(AlSi3O8)
Oβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Oβ“˜ OpalSiO2 · nH2O
Oβ“˜ PurpuriteMn3+(PO4)
Oβ“˜ QuartzSiO2
Oβ“˜ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Oβ“˜ Lithiophilite var. SickleriteLi1-x(Mnx3+Mn2+1-x)PO4
Oβ“˜ SideriteFeCO3
Oβ“˜ SillimaniteAl2(SiO4)O
Oβ“˜ SpodumeneLiAlSi2O6
Oβ“˜ Tantalite(Mn,Fe)(Ta,Nb)2O6
Oβ“˜ TriphyliteLiFe2+PO4
Oβ“˜ VivianiteFe2+Fe22+(PO4)2 · 8H2O
Oβ“˜ Spodumene var. HiddeniteLiAlSi2O6
Oβ“˜ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
Oβ“˜ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
Oβ“˜ Garnet GroupX3Z2(SiO4)3
Oβ“˜ Triphylite GroupVIM1VIM2TO4
Oβ“˜ Jahnsite GroupXM1M22M32(H2O)8(OH)2(PO4)4
FFluorine
Fβ“˜ AmblygoniteLiAl(PO4)F
Fβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Fβ“˜ FluorapatiteCa5(PO4)3F
Fβ“˜ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
NaSodium
Naβ“˜ AlbiteNa(AlSi3O8)
Naβ“˜ Alluaudite(Na,Ca)Mn2+(Fe3+,Mn2+,Fe2+,Mg)2(PO4)3
Naβ“˜ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
MgMagnesium
Mgβ“˜ Alluaudite(Na,Ca)Mn2+(Fe3+,Mn2+,Fe2+,Mg)2(PO4)3
Mgβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
AlAluminium
Alβ“˜ AlbiteNa(AlSi3O8)
Alβ“˜ AmblygoniteLiAl(PO4)F
Alβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Alβ“˜ BerylBe3Al2(Si6O18)
Alβ“˜ ChildreniteFe2+Al(PO4)(OH)2 · H2O
Alβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Alβ“˜ EucryptiteLiAlSiO4
Alβ“˜ MicroclineK(AlSi3O8)
Alβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Alβ“˜ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Alβ“˜ SillimaniteAl2(SiO4)O
Alβ“˜ SpodumeneLiAlSi2O6
Alβ“˜ Spodumene var. HiddeniteLiAlSi2O6
Alβ“˜ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
Alβ“˜ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
SiSilicon
Siβ“˜ AlbiteNa(AlSi3O8)
Siβ“˜ BertranditeBe4(Si2O7)(OH)2
Siβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Siβ“˜ BerylBe3Al2(Si6O18)
Siβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Siβ“˜ EucryptiteLiAlSiO4
Siβ“˜ Opal var. Opal-ANSiO2 · nH2O
Siβ“˜ MicroclineK(AlSi3O8)
Siβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Siβ“˜ OpalSiO2 · nH2O
Siβ“˜ QuartzSiO2
Siβ“˜ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Siβ“˜ SillimaniteAl2(SiO4)O
Siβ“˜ SpodumeneLiAlSi2O6
Siβ“˜ Spodumene var. HiddeniteLiAlSi2O6
Siβ“˜ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
Siβ“˜ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
Siβ“˜ Garnet GroupX3Z2(SiO4)3
PPhosphorus
Pβ“˜ Alluaudite(Na,Ca)Mn2+(Fe3+,Mn2+,Fe2+,Mg)2(PO4)3
Pβ“˜ AmblygoniteLiAl(PO4)F
Pβ“˜ ChildreniteFe2+Al(PO4)(OH)2 · H2O
Pβ“˜ Triphylite var. FerrisickleriteLi1-x(Fex3+Fe2+1-x)PO4
Pβ“˜ FluorapatiteCa5(PO4)3F
Pβ“˜ Heterosite(Fe3+,Mn3+)PO4
Pβ“˜ PurpuriteMn3+(PO4)
Pβ“˜ Lithiophilite var. SickleriteLi1-x(Mnx3+Mn2+1-x)PO4
Pβ“˜ TriphyliteLiFe2+PO4
Pβ“˜ VivianiteFe2+Fe22+(PO4)2 · 8H2O
Pβ“˜ Jahnsite GroupXM1M22M32(H2O)8(OH)2(PO4)4
ClChlorine
Clβ“˜ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
KPotassium
Kβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Kβ“˜ MicroclineK(AlSi3O8)
Kβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Kβ“˜ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
CaCalcium
Caβ“˜ Alluaudite(Na,Ca)Mn2+(Fe3+,Mn2+,Fe2+,Mg)2(PO4)3
Caβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Caβ“˜ FluorapatiteCa5(PO4)3F
Caβ“˜ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
TiTitanium
Tiβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
VVanadium
Vβ“˜ Triphylite GroupVIM1VIM2TO4
MnManganese
Mnβ“˜ Alluaudite(Na,Ca)Mn2+(Fe3+,Mn2+,Fe2+,Mg)2(PO4)3
Mnβ“˜ Heterosite(Fe3+,Mn3+)PO4
Mnβ“˜ PurpuriteMn3+(PO4)
Mnβ“˜ Lithiophilite var. SickleriteLi1-x(Mnx3+Mn2+1-x)PO4
Mnβ“˜ Tantalite(Mn,Fe)(Ta,Nb)2O6
FeIron
Feβ“˜ Alluaudite(Na,Ca)Mn2+(Fe3+,Mn2+,Fe2+,Mg)2(PO4)3
Feβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Feβ“˜ ChildreniteFe2+Al(PO4)(OH)2 · H2O
Feβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Feβ“˜ Triphylite var. FerrisickleriteLi1-x(Fex3+Fe2+1-x)PO4
Feβ“˜ HematiteFe2O3
Feβ“˜ Heterosite(Fe3+,Mn3+)PO4
Feβ“˜ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Feβ“˜ SideriteFeCO3
Feβ“˜ Tantalite(Mn,Fe)(Ta,Nb)2O6
Feβ“˜ TriphyliteLiFe2+PO4
Feβ“˜ VivianiteFe2+Fe22+(PO4)2 · 8H2O
NbNiobium
Nbβ“˜ Tantalite(Mn,Fe)(Ta,Nb)2O6
SnTin
Snβ“˜ CassiteriteSnO2
IIodine
Iβ“˜ Triphylite GroupVIM1VIM2TO4
TaTantalum
Taβ“˜ Tantalite(Mn,Fe)(Ta,Nb)2O6

Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate
USA

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