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Keystone Mine, Magnolia District, Boulder Co., Colorado, USAi
Regional Level Types
Keystone MineMine
Magnolia DistrictMining District
Boulder Co.County
ColoradoState
USACountry

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Key
Latitude & Longitude (WGS84):
39° 59' 18'' North , 105° 22' 4'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Tall Timber208 (2011)3.2km
Mountain Meadows274 (2011)4.1km
Sugarloaf261 (2011)4.6km
Crisman186 (2011)5.8km
Seven Hills121 (2011)6.2km


A gold mine with tellurium mineralization.

Regions containing this locality

North America PlateTectonic Plate
Rocky Mountains, North AmericaMountain Range

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


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

Detailed Mineral List:

Calaverite
Formula: AuTe2
Reference: Minerals of Colorado (1997) Eckel, E. B.; U.S. Geological Survey Professional Paper 223
Coloradoite (TL)
Formula: HgTe
Type Locality:
Description: Closely intermixed with native tellurium and quartz. The type description of coloradoite was based on impure specimens from the Keystone and Mountain Lion mines in the Magnolia district and from the Smuggler mine in the Balarat district.
Reference: "Minerals of Colorado, updated & revised", p. 158, by Eckel, Edwin B., 1997
Ferrotellurite (TL)
Formula: Fe(TeO4) (?)
Type Locality:
Reference: Heys Mineral Index 3rd ed.
Goethite
Formula: α-Fe3+O(OH)
Reference: Van King
Gold
Formula: Au
Reference: Minerals of Colorado (1997) E.B. Eckel
Keystoneite (TL)
Formula: Mg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O
Type Locality:
Description: Golden yellow. Admantine luster. Radiating sprays & parallel growth aggregates of hexagonal, aciciular xls. Ave. size of xls: 0.2 x 0.02 x 0.02 mm.
Reference: "Minerals of Colorado, updated & revised", p. 289, by Eckel, Edwin B., 1997
Magnolite (TL)
Formula: (Hg+2)(Te4+O3)
Type Locality:
Reference: Minerals of Colorado (1997) Eckel, E. B.
Melonite
Formula: NiTe2
Reference: Minerals of Colorado (1997) Eckel, E. B.
Mercury
Formula: Hg
Reference: Minerals of Colorado (1997) Eckel, E. B.
'Native Amalgam'
Formula: (Ag,Hg)
Reference: Minerals of Colorado (1997) Eckel, E. B.
Paratellurite
Formula: TeO2
Reference: Minerals of Colorado (1997) Eckel, E. B.
Pyrite
Formula: FeS2
Reference: Minerals of Colorado (1997) Eckel, E. B.; U.S. Geological Survey Professional Paper 223
Quartz
Formula: SiO2
Reference: Dana 6: 11, 980; Dana 7:I: 594.; U.S. Geological Survey Professional Paper 223
Roscoelite
Formula: K(V3+,Al)2(AlSi3O10)(OH)2
Reference: Minerals of Colorado (1997) E.B. Eckel; U.S. Geological Survey Professional Paper 223
Silver
Formula: Ag
Reference: Minerals of Colorado (1997) Eckel, E. B.
Stibnite
Formula: Sb2S3
Reference: Minerals of Colorado (1997) Eckel, E. B.
Sylvanite
Formula: (Au,Ag)2Te4
Reference: Minerals of Colorado (1997) Eckel, E. B.
Tellurite
Formula: TeO2
Reference: Dana 6: 11, 980; Dana 7:I: 594.
Tellurium
Formula: Te
Reference: Dana 6: 11, 980; Dana 7:I: 594.; U.S. Geological Survey Professional Paper 223
Weishanite
Formula: (Au,Ag,Hg)
Description: structural ID confirmed weishanite. these are the best known crystals of weishanite.
Reference: EDS analysed by J.Desor 2016_11_28; Bindi, L., Keutsch, F.N., Lepore, G.O. (2018): Structural and chemical study of weishanite, (Au,Ag,Hg), from the Keystone mine, Colorado, USA. Mineralogical Magazine 82, 1141-1145.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Mercury1.AD.05Hg
Silver1.AA.05Ag
Tellurium1.CC.10Te
Weishanite1.AD.20a(Au,Ag,Hg)
Group 2 - Sulphides and Sulfosalts
Calaverite2.EA.10AuTe2
Coloradoite (TL)2.CB.05aHgTe
Melonite2.EA.20NiTe2
Pyrite2.EB.05aFeS2
Stibnite2.DB.05Sb2S3
Sylvanite2.EA.05(Au,Ag)2Te4
Group 4 - Oxides and Hydroxides
Goethite4.00.α-Fe3+O(OH)
Keystoneite (TL)4.JM.05Mg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O
Magnolite (TL)4.JK.60(Hg+2)(Te4+O3)
Paratellurite4.DE.25TeO2
Quartz4.DA.05SiO2
Tellurite4.DE.20TeO2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Ferrotellurite (TL)7.AB.10Fe(TeO4) (?)
Group 9 - Silicates
Roscoelite9.EC.15K(V3+,Al)2(AlSi3O10)(OH)2
Unclassified Minerals, Rocks, etc.
'Native Amalgam'-(Ag,Hg)

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
Mercury1.1.7.1Hg
Silver1.1.1.2Ag
Weishanite1.1.8.6(Au,Ag,Hg)
Semi-metals and non-metals
Tellurium1.3.4.2Te
Group 2 - SULFIDES
AmXp, with m:p = 1:1
Coloradoite (TL)2.8.2.5HgTe
AmBnXp, with (m+n):p = 2:3
Stibnite2.11.2.1Sb2S3
AmBnXp, with (m+n):p = 1:2
Calaverite2.12.13.2AuTe2
Melonite2.12.14.1NiTe2
Pyrite2.12.1.1FeS2
Sylvanite2.12.13.3(Au,Ag)2Te4
Group 4 - SIMPLE OXIDES
AX2
Paratellurite4.4.3.2TeO2
Tellurite4.4.6.1TeO2
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Group 34 - SELENITES, TELLURITES AND SULFITES
A(XO3)
Magnolite (TL)34.1.7.1(Hg+2)(Te4+O3)
A2(XO3)3·xH2O
Keystoneite (TL)34.3.2.3Mg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Roscoelite71.2.2a.4K(V3+,Al)2(AlSi3O10)(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
Ferrotellurite (TL)-Fe(TeO4) (?)
'Native Amalgam'-(Ag,Hg)

List of minerals for each chemical element

HHydrogen
H KeystoneiteMg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O
H RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
H Goethiteα-Fe3+O(OH)
OOxygen
O Magnolite(Hg2+)(Te4+O3)
O KeystoneiteMg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O
O FerrotelluriteFe(TeO4) (?)
O TelluriteTeO2
O QuartzSiO2
O ParatelluriteTeO2
O RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
O Goethiteα-Fe3+O(OH)
MgMagnesium
Mg KeystoneiteMg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O
AlAluminium
Al RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
SiSilicon
Si QuartzSiO2
Si RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
SSulfur
S PyriteFeS2
S StibniteSb2S3
KPotassium
K RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
VVanadium
V RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
MnManganese
Mn KeystoneiteMg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O
FeIron
Fe KeystoneiteMg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O
Fe FerrotelluriteFe(TeO4) (?)
Fe PyriteFeS2
Fe Goethiteα-Fe3+O(OH)
NiNickel
Ni KeystoneiteMg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O
Ni MeloniteNiTe2
AgSilver
Ag Native Amalgam(Ag,Hg)
Ag Sylvanite(Au,Ag)2Te4
Ag SilverAg
Ag Weishanite(Au,Ag,Hg)
SbAntimony
Sb StibniteSb2S3
TeTellurium
Te Magnolite(Hg2+)(Te4+O3)
Te ColoradoiteHgTe
Te KeystoneiteMg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O
Te FerrotelluriteFe(TeO4) (?)
Te TelluriteTeO2
Te TelluriumTe
Te CalaveriteAuTe2
Te Sylvanite(Au,Ag)2Te4
Te MeloniteNiTe2
Te ParatelluriteTeO2
AuGold
Au CalaveriteAuTe2
Au Sylvanite(Au,Ag)2Te4
Au GoldAu
Au Weishanite(Au,Ag,Hg)
HgMercury
Hg Magnolite(Hg2+)(Te4+O3)
Hg ColoradoiteHgTe
Hg MercuryHg
Hg Native Amalgam(Ag,Hg)
Hg Weishanite(Au,Ag,Hg)

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Dana, E.S. (1892) System of Mineralogy, 6th. Edition, New York: 11, 980.
Palache, C., Berman, H. & Frondel, C. (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged, 834 pp.: 594.
Eckel, Edwin B. (1997), Minerals of Colorado, updated & revised.
Bindi, L., Keutsch, F.N., Lepore, G.O. (2018): Structural and chemical study of weishanite, (Au,Ag,Hg), from the Keystone mine, Colorado, USA. Mineralogical Magazine 82, 1141-1145.


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