Vote for your favorite mineral in #MinCup26! - Monazite-(Ce) vs. Andalusite
It's a showdown with rare earth elemental ore Monazite-(Ce) and index mineral Andalusite.
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Biotite from
Last Chance vein, Nuclear Fuels and Rare Metals Corporation Prospect (Lake Vein; Contact Vein; Deer Vein; Silver Queen 52-B; Silver Queen 38-A; Wonder Lode; Cago Vein; Black Bull; Wonder Vein), Lemhi Pass Mining District, Lemhi County, Idaho, USA


Locality type:Vein
Classification
Species:'Biotite' (not an IMA approved species)
Formula:K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Last Chance vein, Nuclear Fuels and Rare Metals Corporation Prospect (Lake Vein; Contact Vein; Deer Vein; Silver Queen 52-B; Silver Queen 38-A; Wonder Lode; Cago Vein; Black Bull; Wonder Vein), Lemhi Pass Mining District, Lemhi County, Idaho, USA
Data Identifiers
Mindat Occurrence Record ID:1896164
Long-form Identifier:1:3:1896164:5
GUID (UUID V4):0
Nearest other occurrences of Biotite
2.2km (1.3 miles) ⓘWonder Mine (Wonder Lodes Nos. 1 to 5 and Buckhorn Claims), McDevitt Mining District, Lemhi County, Idaho, USA
2.3km (1.4 miles) ⓘCago No. 12 Claim, Lemhi Pass Mining District, Lemhi County, Idaho, USA
3.7km (2.3 miles) ⓘNo. 31 Thorium Deposit, Lemhi Pass Mining District, Lemhi County, Idaho, USA
3.8km (2.3 miles) ⓘBlack Bear Prospect, Lemhi Pass Mining District, Lemhi County, Idaho, USA
4.7km (2.9 miles) ⓘBuffalo Mine (Stenson S), McDevitt Mining District, Lemhi County, Idaho, USA
5.1km (3.2 miles) ⓘBig Thor Nos. 1 and 2 Vein Prospect, Lemhi Pass Mining District, Lemhi County, Idaho, USA
5.9km (3.7 miles) ⓘSparky Prospect, McDevitt Mining District, Lemhi County, Idaho, USA
6.2km (3.8 miles) ⓘLucky Horseshoe prospect, Lemhi Pass Mining District, Lemhi County, Idaho, USA
6.2km (3.8 miles) ⓘLucky Horseshoe Claim Group, McDevitt Mining District, Lemhi County, Idaho, USA
9.2km (5.7 miles) ⓘLone Star No. 2 Occurrence (Idaho Thorium Showing No. 1), McDevitt Mining District, Lemhi County, Idaho, USA
References
Gillerman, Virginia S.; Jercinovic, Michael J.; Schmitz, Mark D. (2025) Neodymium-Rich Monazite of the Lemhi Pass District, Idaho and Montana: Chemistry and Geochronology. Minerals, 15 (11). doi:10.3390/min15111156
 
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