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
Standard Mine, Ruby Mining District (Elk Mountain Mining District; Irwin Mining District), Gunnison County, Colorado, USA


Locality type:Mine
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 Standard Mine, Ruby Mining District (Elk Mountain Mining District; Irwin Mining District), Gunnison County, Colorado, USA
Data Identifiers
Mindat Occurrence Record ID:715466
Long-form Identifier:1:3:715466:9
GUID (UUID V4):0
Nearest other occurrences of Biotite
3.7km (2.3 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
18.9km (11.8 miles) ⓘWest Maroon Pass Area, Pitkin County, Colorado, USA
29.3km (18.2 miles) ⓘItalian Mountain, Taylor Park, Dorchester Mining District, Gunnison County, Colorado, USA
32.9km (20.4 miles) ⓘComet group (Comet prospect), Gunnison County, Colorado, USA
47.0km (29.2 miles) ⓘGunnison District Occurrence (W.C. Dillon; MS 10715), Gunnison Mining District, Gunnison County, Colorado, USA
49.3km (30.6 miles) ⓘBoulder Creek, Gold Brick Mining District, Gunnison County, Colorado, USA
49.9km (31.0 miles) ⓘBlack Wonder Occurrence, Quartz Creek Pegmatite Mining District, Gunnison County, Colorado, USA
51.0km (31.7 miles) ⓘBucky pegmatite (New Anniversary; Willow Creek), Quartz Creek Pegmatite Mining District, Gunnison County, Colorado, USA
51.1km (31.8 miles) ⓘGold Basin District Occurrence (MS 1984; Patented Claim: Belle Flora), Green Mountain Mining District (Gold Basin Mining District; Iris Mining District), Gunnison County, Colorado, USA
51.5km (32.0 miles) ⓘIndependence (Independence Pass), Columbia Mining District (Ashcroft Mining District), Pitkin County, Colorado, USA
References
Caine, J.S., Manning, A.H., Berger, B.R., Kremer, Y., Guzman, M.A., Eberl, D.D., and Schuller, K. (2010): USGS Open-File Report 10-1008
 
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