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
Comet group (Comet prospect), Gunnison County, Colorado, USA


Locality type:Claim
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 Comet group (Comet prospect), Gunnison County, Colorado, USA
Data Identifiers
Mindat Occurrence Record ID:430569
Long-form Identifier:1:3:430569:9
GUID (UUID V4):0
Nearest other occurrences of Biotite
5.5km (3.4 miles) ⓘItalian Mountain, Taylor Park, Dorchester Mining District, Gunnison County, Colorado, USA
19.3km (12.0 miles) ⓘIndependence (Independence Pass), Columbia Mining District (Ashcroft Mining District), Pitkin County, Colorado, USA
23.3km (14.5 miles) ⓘWest Maroon Pass Area, Pitkin County, Colorado, USA
30.0km (18.6 miles) ⓘMt. Emmons/Crested Butte (Chautauqua; Daisey; Daisey Mine; Mt. Emmons; Crested Butte), Elk Mountain Mining District (Snowmass Mountain Mining District), Gunnison County, Colorado, USA
32.9km (20.4 miles) ⓘStandard Mine, Ruby Mining District (Elk Mountain Mining District; Irwin Mining District), Gunnison County, Colorado, USA
40.5km (25.2 miles) ⓘBon Ton Mine, Monarch Mining District, Chaffee County, Colorado, USA
40.6km (25.3 miles) ⓘBoulder Creek, Gold Brick Mining District, Gunnison County, Colorado, USA
42.9km (26.7 miles) ⓘDutch Flat Gulch, Gold Brick Mining District, Gunnison County, Colorado, USA
43.3km (26.9 miles) ⓘTurquoise Lake Occurrence, St. Kevin - Independence, Lake County, Colorado, USA
44.3km (27.5 miles) ⓘPanco Manganese Deposit, Snowmass Area, Pitkin County, Colorado, USA
References
Hanley, J.B., Heinrich, E.W., Page, L.R. (1950) Pegmatite investigations in Colorado, Wyoming, and Utah, 1942-1944. Professional Paper 227. US Geological Survey doi:10.3133/pp227
Eckel, Edwin Butt; Cobban, Robert R.; Mosburg, Shirley K.; Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
 
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