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

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Latitude & Longitude (WGS84):
39° 59' 18'' North , 105° 22' 4'' West
Latitude & Longitude (decimal):
39.98861,-105.36778
GeoHash:
G#: 9xj56r9w8
GRN:
N27W59
Type:
Mine
KΓΆppen climate type:
Dfb : Warm-summer humid continental climate
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
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
Flatirons Mineral ClubBoulder, Colorado9km
Mile High Rock and Mineral SocietyArvada, Colorado32km
Colorado Mineral SocietyLakewood, Colorado40km
Denver Gem and Mineral GuildDenver, Colorado43km
Friends of Mineralogy - Colorado Chapter Denver, Colorado43km
Mindat Locality ID:
3592
Long-form identifier:
mindat:1:2:3592:0
GUID (UUID V4):
dabbbc52-9f7d-4aac-8122-9866a0a484e4


A gold mine with tellurium mineralization.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


18 valid minerals. 3 (TL) - type locality of valid minerals.

Detailed Mineral List:

β“˜ Calaverite
Formula: AuTe2
β“˜ 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.
β“˜ Goethite
Formula: Ξ±-Fe3+O(OH)
β“˜ Gold
Formula: Au
β“˜ 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.
β“˜ Magnolite (TL)
Formula: [Hg2]2+[Te4+O3]
Type Locality:
β“˜ Melonite
Formula: NiTe2
β“˜ Mercury
Formula: Hg
β“˜ Paratellurite
Formula: TeO2
β“˜ Pyrite
Formula: FeS2
β“˜ Quartz
Formula: SiO2
β“˜ Roscoelite
Formula: K(V3+,Al)2(AlSi3O10)(OH)2
β“˜ Silver
Formula: Ag
β“˜ Silver var. Native Amalgam
Formula: (Ag,Hg)
β“˜ Stibnite
Formula: Sb2S3
β“˜ Sylvanite
Formula: AgAuTe4
β“˜ Tellurite
Formula: TeO2
β“˜ Tellurium
Formula: Te
β“˜ Weishanite
Formula: (Au,Ag,Hg)
Description: structural ID confirmed weishanite. these are the best known crystals of weishanite.

Gallery:

HgTeβ“˜ Coloradoite (TL)
[Hg2]2+[Te4+O3]β“˜ Magnolite (TL)
(Au,Ag,Hg)β“˜ Weishanite

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
β“˜Silver
var. Native Amalgam		1.AA.05(Ag,Hg)
β“˜Gold1.AA.05Au
β“˜Silver1.AA.05Ag
β“˜Mercury1.AD.05Hg
β“˜Weishanite1.AD.20a(Au,Ag,Hg)
β“˜Tellurium1.CC.10Te
Group 2 - Sulphides and Sulfosalts
β“˜Coloradoite (TL)2.CB.05aHgTe
β“˜Stibnite2.DB.05Sb2S3
β“˜Sylvanite2.EA.05AgAuTe4
β“˜Calaverite2.EA.10AuTe2
β“˜Melonite2.EA.20NiTe2
β“˜Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
β“˜Goethite4.00.Ξ±-Fe3+O(OH)
β“˜Quartz4.DA.05SiO2
β“˜Tellurite4.DE.20TeO2
β“˜Paratellurite4.DE.25TeO2
β“˜Magnolite (TL)4.JK.60[Hg2]2+[Te4+O3]
β“˜Keystoneite (TL)4.JM.05Mg0.5Ni2+Fe3+(Te4+O3)3 Β· 4.5H2O
Group 9 - Silicates
β“˜Roscoelite9.EC.15K(V3+,Al)2(AlSi3O10)(OH)2

List of minerals for each chemical element

HHydrogen
Hβ“˜ GoethiteΞ±-Fe3+O(OH)
Hβ“˜ KeystoneiteMg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O
Hβ“˜ RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
OOxygen
Oβ“˜ GoethiteΞ±-Fe3+O(OH)
Oβ“˜ KeystoneiteMg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O
Oβ“˜ Magnolite[Hg2]2+[Te4+O3]
Oβ“˜ ParatelluriteTeO2
Oβ“˜ QuartzSiO2
Oβ“˜ RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
Oβ“˜ TelluriteTeO2
MgMagnesium
Mgβ“˜ KeystoneiteMg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O
AlAluminium
Alβ“˜ RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
SiSilicon
Siβ“˜ QuartzSiO2
Siβ“˜ RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
SSulfur
Sβ“˜ PyriteFeS2
Sβ“˜ StibniteSb2S3
KPotassium
Kβ“˜ RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
VVanadium
Vβ“˜ RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
FeIron
Feβ“˜ GoethiteΞ±-Fe3+O(OH)
Feβ“˜ KeystoneiteMg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O
Feβ“˜ PyriteFeS2
NiNickel
Niβ“˜ KeystoneiteMg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O
Niβ“˜ MeloniteNiTe2
AgSilver
Agβ“˜ Silver var. Native Amalgam(Ag,Hg)
Agβ“˜ SilverAg
Agβ“˜ SylvaniteAgAuTe4
Agβ“˜ Weishanite(Au,Ag,Hg)
SbAntimony
Sbβ“˜ StibniteSb2S3
TeTellurium
Teβ“˜ CalaveriteAuTe2
Teβ“˜ ColoradoiteHgTe
Teβ“˜ KeystoneiteMg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O
Teβ“˜ Magnolite[Hg2]2+[Te4+O3]
Teβ“˜ MeloniteNiTe2
Teβ“˜ ParatelluriteTeO2
Teβ“˜ SylvaniteAgAuTe4
Teβ“˜ TelluriteTeO2
Teβ“˜ TelluriumTe
AuGold
Auβ“˜ CalaveriteAuTe2
Auβ“˜ GoldAu
Auβ“˜ SylvaniteAgAuTe4
Auβ“˜ Weishanite(Au,Ag,Hg)
HgMercury
Hgβ“˜ Silver var. Native Amalgam(Ag,Hg)
Hgβ“˜ ColoradoiteHgTe
Hgβ“˜ Magnolite[Hg2]2+[Te4+O3]
Hgβ“˜ MercuryHg
Hgβ“˜ Weishanite(Au,Ag,Hg)

Other Regions, Features and Areas containing this locality

North America
North America 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

Genth, F.A. (1878) On some tellurium and vanadium minerals. Proceedings of the American Philosophical Society: 17: 113-123.
Dana, Edward Salisbury (1892) A System of Mineralogy (6th ed.)
Palache, Charles, Berman, Harry, Frondel, Clifford (1944) The System of Mineralogy (7th ed.) Vol. 1 - Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, New York.
Back, M.E., Roberts, A.C., LePage, Y., Mandarino, J.A. (1988) Keystoneite, a new tellurite from the Keystone mine, Colorado, U.S.A. Joint Meeting Geological Association of Canada – Mineralogical Association of Canada, Program and Abstracts, 13, A4.
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
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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