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Hidden Lake, Horseshoe District, Park County, Montana, USAi
Regional Level Types
Hidden LakeVolcanic Field
Horseshoe DistrictMining District
Park CountyCounty
MontanaState
USACountry

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04450640017883612894686.jpg
Looking west across Hidden Lake

Hidden Lake, Horseshoe District, Park County, Montana, USA
07254860017883616366860.jpg
Extensive glacial moraines at Hidden Lake

Hidden Lake, Horseshoe District, Park County, Montana, USA
01715570017883616373235.jpg
Glacial moraines at Hidden Lake

Hidden Lake, Horseshoe District, Park County, Montana, USA
00728330017883612411515.jpg
Looking west across Hidden Lake

Hidden Lake, Horseshoe District, Park County, Montana, USA
07468810017883615009387.jpg
Extensive glacial moraines at Hidden Lake

Hidden Lake, Horseshoe District, Park County, Montana, USA
09764570017883615352879.jpg
Glacial moraines at Hidden Lake

Hidden Lake, Horseshoe District, Park County, Montana, USA
04450640017883612894686.jpg
Looking west across Hidden Lake

Hidden Lake, Horseshoe District, Park County, Montana, USA
07254860017883616366860.jpg
Extensive glacial moraines at Hidden Lake

Hidden Lake, Horseshoe District, Park County, Montana, USA
Latitude & Longitude (WGS84):
45° 3' 47'' North , 110° 16' 26'' West
Latitude & Longitude (decimal):
45.06333,-110.27389
GRN:
N31W56
Type:
Volcanic Field - last checked 2026
Age:
66.0 Ma to present day
Geologic Time:
Cenozoic
Köppen climate type:
Dfc : Subarctic climate
Mindat Locality ID:
481653
Long-form identifier:
mindat:1:2:481653:2
GUID (UUID V4):
0
Other/historical names associated with this locality:
Hidden Lake


Absaroka volcanic flows surrounding a shallow lake. Extensive glacial moraines with steep volcanic cliffs. Whole-rock geochem and petrography coming soon.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


17 valid minerals.

Detailed Mineral List:

ⓘ Aluminoceladonite
Formula: K(MgAl◻)(Si4O10)(OH)2
References:
Paula Piilonen CollectionIdentified by Paula Piilonen: Visual Identification, XRD
ⓘ Anorthite
Formula: Ca(Al2Si2O8)
References:
Paula Piilonen CollectionIdentified by Paula Piilonen: XRD
ⓘ Aragonite
Formula: CaCO3
References:
Paula Piilonen CollectionIdentified by Paula Piilonen: XRD
ⓘ Calcite
Formula: CaCO3
References:
Paula Piilonen CollectionIdentified by Paula Piilonen: XRD
ⓘ Cristobalite
Formula: SiO2
References:
Paula Piilonen CollectionIdentified by Paula Piilonen: XRD
ⓘ Goethite
Formula: Fe3+O(OH)
References:
Paula Piilonen CollectionIdentified by Paula Piilonen: XRD
ⓘ Gypsum
Formula: CaSO4 · 2H2O
References:
Paula Piilonen CollectionIdentified by Paula Piilonen: XRD
ⓘ Hematite
Formula: Fe2O3
References:
Paula Piilonen CollectionIdentified by Paula Piilonen: XRD
ⓘ Monohydrocalcite
Formula: CaCO3 · H2O
References:
P.C. PiilonenIdentified by Paula Piilonen: XRD
ⓘ Nesquehonite
Formula: MgCO3 · 3H2O
References:
Paula Piilonen CollectionIdentified by Paula Piilonen: XRD
ⓘ Nontronite
Formula: Na0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
References:
Paula Piilonen CollectionIdentified by Paula Piilonen: XRD
ⓘ Quartz
Formula: SiO2
References:
Paula Piilonen CollectionIdentified by Paula Piilonen: XRD
ⓘ Rhodochrosite
Formula: MnCO3
References:
Paula Piilonen CollectionIdentified by Paula Piilonen: XRD
ⓘ Sanidine
Formula: K(AlSi3O8)
References:
Paula Piilonen CollectionIdentified by Paula Piilonen: XRD
ⓘ Saponite
Formula: Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
References:
Paula Piilonen CollectionIdentified by Paula Piilonen: XRD
ⓘ Tridymite
Formula: SiO2
References:
Paula Piilonen CollectionIdentified by Paula Piilonen: XRD
ⓘ Weddellite
Formula: Ca(C2O4) · (2.5-x)H2O
References:
Paula Piilonen CollectionIdentified by Paula Piilonen: XRD

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘQuartz4.00.05SiO2
ⓘHematite4.CB.05Fe2O3
ⓘTridymite4.DA.10SiO2
ⓘCristobalite4.DA.15SiO2
ⓘGoethite4.FD.10Fe3+O(OH)
Group 5 - Nitrates and Carbonates
ⓘCalcite5.AB.05CaCO3
ⓘRhodochrosite5.AB.05MnCO3
ⓘAragonite5.AB.15CaCO3
ⓘNesquehonite5.CA.05MgCO3 · 3H2O
ⓘMonohydrocalcite5.CB.20CaCO3 · H2O
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘGypsum7.CD.40CaSO4 · 2H2O
Group 9 - Silicates
ⓘAluminoceladonite9.EC.15K(MgAl◻)(Si4O10)(OH)2
ⓘNontronite9.EC.40Na0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
ⓘSaponite9.EC.45Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
ⓘSanidine9.FA.30K(AlSi3O8)
ⓘAnorthite9.FA.35Ca(Al2Si2O8)
Group 10 - Organic Compounds
ⓘWeddellite10.AB.40Ca(C2O4) · (2.5-x)H2O

List of minerals for each chemical element

HHydrogen
Hⓘ GoethiteFe3+O(OH)
Hⓘ GypsumCaSO4 · 2H2O
Hⓘ MonohydrocalciteCaCO3 · H2O
Hⓘ NesquehoniteMgCO3 · 3H2O
Hⓘ NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
Hⓘ SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Hⓘ WeddelliteCa(C2O4) · (2.5-x)H2O
Hⓘ AluminoceladoniteK(MgAl◻)(Si4O10)(OH)2
CCarbon
Cⓘ AragoniteCaCO3
Cⓘ CalciteCaCO3
Cⓘ MonohydrocalciteCaCO3 · H2O
Cⓘ NesquehoniteMgCO3 · 3H2O
Cⓘ RhodochrositeMnCO3
Cⓘ WeddelliteCa(C2O4) · (2.5-x)H2O
OOxygen
Oⓘ AnorthiteCa(Al2Si2O8)
Oⓘ AragoniteCaCO3
Oⓘ CalciteCaCO3
Oⓘ CristobaliteSiO2
Oⓘ GoethiteFe3+O(OH)
Oⓘ GypsumCaSO4 · 2H2O
Oⓘ HematiteFe2O3
Oⓘ MonohydrocalciteCaCO3 · H2O
Oⓘ NesquehoniteMgCO3 · 3H2O
Oⓘ NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
Oⓘ QuartzSiO2
Oⓘ RhodochrositeMnCO3
Oⓘ SanidineK(AlSi3O8)
Oⓘ SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Oⓘ TridymiteSiO2
Oⓘ WeddelliteCa(C2O4) · (2.5-x)H2O
Oⓘ AluminoceladoniteK(MgAl◻)(Si4O10)(OH)2
NaSodium
Naⓘ NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
MgMagnesium
Mgⓘ NesquehoniteMgCO3 · 3H2O
Mgⓘ SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Mgⓘ AluminoceladoniteK(MgAl◻)(Si4O10)(OH)2
AlAluminium
Alⓘ AnorthiteCa(Al2Si2O8)
Alⓘ NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
Alⓘ SanidineK(AlSi3O8)
Alⓘ SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Alⓘ AluminoceladoniteK(MgAl◻)(Si4O10)(OH)2
SiSilicon
Siⓘ AnorthiteCa(Al2Si2O8)
Siⓘ CristobaliteSiO2
Siⓘ NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
Siⓘ QuartzSiO2
Siⓘ SanidineK(AlSi3O8)
Siⓘ SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Siⓘ TridymiteSiO2
Siⓘ AluminoceladoniteK(MgAl◻)(Si4O10)(OH)2
SSulfur
Sⓘ GypsumCaSO4 · 2H2O
KPotassium
Kⓘ SanidineK(AlSi3O8)
Kⓘ AluminoceladoniteK(MgAl◻)(Si4O10)(OH)2
CaCalcium
Caⓘ AnorthiteCa(Al2Si2O8)
Caⓘ AragoniteCaCO3
Caⓘ CalciteCaCO3
Caⓘ GypsumCaSO4 · 2H2O
Caⓘ MonohydrocalciteCaCO3 · H2O
Caⓘ SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Caⓘ WeddelliteCa(C2O4) · (2.5-x)H2O
MnManganese
Mnⓘ RhodochrositeMnCO3
FeIron
Feⓘ GoethiteFe3+O(OH)
Feⓘ HematiteFe2O3
Feⓘ NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
Feⓘ SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O

Other Regions, Features and Areas containing this locality

North AmericaContinent
North America PlateTectonic Plate
USA

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

The geochemistry and geochronology of the Eocene Absaroka volcanic province, northern Wyoming and southwest Montana, United States of America M. M. Hiza Oregon State University Ph.D. 1999
FOOSE, RICHARD M., WISE, DONALD U., GARBARINI, GEORGE S. (1961) Structural Geology of the Beartooth Mountains, Montana and Wyoming. Geological Society of America Bulletin, 72 (8) 1143 doi:10.1130/0016-7606(1961)72[1143:sgotbm]2.0.co;2
CHADWICK, ROBERT A. (1970) Belts of Eruptive Centers in the Absaroka-Gallatin Volcanic Province, Wyoming-Montana. Geological Society of America Bulletin, 81 (1) 267 doi:10.1130/0016-7606(1970)81[267:boecit]2.0.co;2
Simons, Frank S., Armbrustmacher, Theodore, Van Noy, Ronald, Zilka, Nicolas, Federspiel, Frank, Ridenour, James, with a section on Interpretation of aeromagnetic data, by Anderson (1973) Mineral resources of the Beartooth Primitive Area and vicinity, Carbon, Park, Stillwater, and Sweet Grass Counties, Montana, and Park County, Wyoming. Open-File Report Vol. 1973 (73-263) US Geological Survey doi:10.3133/ofr73263
(1975) Mineral resources of the Absaroka Primitive Area and vicinity, Park and Sweet Grass counties, Montana, with a section on interpretation of geophysical data. Bulletin 1391b. US Geological Survey doi:10.3133/b1391b
Hammarstrom, J.M., Gray, K.J. (1993) Geochemical data for selected rock samples from the Absaroka-Beartooth study area, Custer and Gallatin National Forests, Montana. Open-File Report Vol. 1993 (93-505) US Geological Survey doi:10.3133/ofr93505
Harlan, Stephen S., Snee, Lawrence W., Geissman, John W. (1996) 40Ar/39Ar geochronology and paleomagnetism of Independence volcano, Absaroka Volcanic Supergroup, Beartooth Mountains, Montana. Canadian Journal of Earth Sciences, 33 (12) 1648-1654 doi:10.1139/e96-125
Mogk, David W.; Mueller, Paul A.; Henry, Darrell J. (2025) The Geoheritage of the Beartooth Mountains, Montana and Wyoming, USA: Traversing Four Billion Years of Earth History. Geoheritage, 17 (4). doi:10.1007/s12371-025-01212-3
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