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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Gneiss from
Bon Ton Mine, Monarch Mining District, Chaffee County, Colorado, USA


Locality type:Mine
Classification
Type:Gneiss
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Gneiss data
Locality Data:Click here to view Bon Ton Mine, Monarch Mining District, Chaffee County, Colorado, USA
Data Identifiers
Mindat Occurrence Record ID:1493747
Long-form Identifier:1:3:1493747:3
GUID (UUID V4):0
Nearest other occurrences of Gneiss
8.9km (5.5 miles) ⓘSacramento, Gold Brick Mining District, Gunnison County, Colorado, USA
9.5km (5.9 miles) ⓘBrittle Silver Occurrence, Tomichi Mining District (White Pine Mining District), Gunnison County, Colorado, USA
9.5km (5.9 miles) ⓘN.B.C. Occurrence, Tomichi Mining District (White Pine Mining District), Gunnison County, Colorado, USA
10.3km (6.4 miles) ⓘChronicle, Gold Brick Mining District, Gunnison County, Colorado, USA
10.3km (6.4 miles) ⓘLamphere Lakes Occurrence, Quartz Creek Mining District, Gunnison County, Colorado, USA
10.9km (6.8 miles) ⓘSandy Hook Occurrence, Gold Brick Mining District, Gunnison County, Colorado, USA
10.9km (6.8 miles) ⓘBassick, Gold Brick Mining District, Gunnison County, Colorado, USA
17.6km (11.0 miles) ⓘRevenue, Gold Brick Mining District, Gunnison County, Colorado, USA
19.5km (12.1 miles) ⓘPegmatite No. 537 Occurrence, Quartz Creek Pegmatite Mining District, Gunnison County, Colorado, USA
19.5km (12.1 miles) ⓘPegmatite No. 538 Occurrence, Quartz Creek Pegmatite Mining District, Gunnison County, Colorado, USA
References
Spry, Paul G.; McFadden, Scott; Teale, Graham S.; Alers, Brian; Shallow, John M.; Glenn, Justin M. (2022) Nodular sillimanite rocks as field indicators to metamorphosed massive sulfide deposits. Ore Geology Reviews, 141. 104632 doi:10.1016/j.oregeorev.2021.104632
Berke, Edward H., Spry, Paul G., Heimann, Adriana, Teale, Graham S., Johnson, Benjamin, von der Handt, Anette, Alers, Brian, Shallow, John M. (2023) The genesis of metamorphosed Paleoproterozoic massive sulphide occurrences in central Colorado: geological, mineralogical and sulphur isotope constraints. Geological Magazine, 160 (7) 1345-1375 doi:10.1017/s0016756823000407
 
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