Vote for your favorite mineral in #MinCup26! - Quartz vs. Asagiite
It's a classic vs a newbie as the most common named mineral in the crust Quartz is up against an exceedingly-rare sea foam-green mineral discovered just a few years ago Asagiite.
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Biotite from
Lucky Horseshoe prospect, Lemhi Pass Mining District, Lemhi County, Idaho, USA


Locality type:Prospect
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 Lucky Horseshoe prospect, Lemhi Pass Mining District, Lemhi County, Idaho, USA
Data Identifiers
Mindat Occurrence Record ID:1896209
Long-form Identifier:1:3:1896209:7
GUID (UUID V4):0
Nearest other occurrences of Biotite
0.1km (0.1 miles) ⓘLucky Horseshoe Claim Group, McDevitt Mining District, Lemhi County, Idaho, USA
1.0km (0.6 miles) ⓘSparky Prospect, McDevitt Mining District, Lemhi County, Idaho, USA
1.7km (1.1 miles) ⓘBuffalo Mine (Stenson S), McDevitt Mining District, Lemhi County, Idaho, USA
3.1km (1.9 miles) ⓘBlack Bear Prospect, Lemhi Pass Mining District, Lemhi County, Idaho, USA
3.5km (2.2 miles) ⓘNo. 31 Thorium Deposit, Lemhi Pass Mining District, Lemhi County, Idaho, USA
4.1km (2.5 miles) ⓘWonder Mine (Wonder Lodes Nos. 1 to 5 and Buckhorn Claims), McDevitt Mining District, Lemhi County, Idaho, USA
4.2km (2.6 miles) ⓘCago No. 12 Claim, Lemhi Pass Mining District, Lemhi County, Idaho, USA
5.5km (3.4 miles) ⓘLone Star No. 2 Occurrence (Idaho Thorium Showing No. 1), McDevitt Mining District, Lemhi County, Idaho, USA
5.8km (3.6 miles) ⓘIdaho Thorium Showing No. 3 Occurrence, McDevitt Mining District, Lemhi County, Idaho, USA
6.2km (3.8 miles) ⓘ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
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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