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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Tourmaline from
Brown Derby No. 1, Brown Derby Mine, Quartz Creek Pegmatite Mining District, Gunnison County, Colorado, USA


Locality type:Mine
Classification
Species:'Tourmaline' (not an IMA approved species)
Formula:AD3G6(T6O18)(BO3)3X3Z
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Tourmaline data
Locality Data:Click here to view Brown Derby No. 1, Brown Derby Mine, Quartz Creek Pegmatite Mining District, Gunnison County, Colorado, USA
Data Identifiers
Mindat Occurrence Record ID:1004487
Long-form Identifier:1:3:1004487:2
GUID (UUID V4):0
Nearest other occurrences of Tourmaline
0.1km (0.1 miles) ⓘBrown Derby Mine, Quartz Creek Pegmatite Mining District, Gunnison County, Colorado, USA
1.1km (0.7 miles) ⓘBrown Derby No. 5 Mine, Brown Derby Mine, Quartz Creek Pegmatite Mining District, Gunnison County, Colorado, USA
22.5km (14.0 miles) ⓘGreen Mountain Mining District (Gold Basin Mining District; Iris Mining District), Gunnison County, Colorado, USA
23.2km (14.4 miles) ⓘLucky Strike Mine (Modoc; MS 17455; Horse Shoe; MS 17122; Belle Valaisane; MS 13897; Only Chance; MS 17455; Mammoth; MS 13897; Patented Claims: Lucky Strike; MS 9125), Green Mountain Mining District (Gold Basin Mining District; Iris Mining District), Gunnison County, Colorado, USA
25.8km (16.0 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
25.9km (16.1 miles) ⓘGunnison District Occurrence (W.C. Dillon; MS 10715), Gunnison Mining District, Gunnison County, Colorado, USA
26.9km (16.7 miles) ⓘDenver City Mine, Green Mountain Mining District (Gold Basin Mining District; Iris Mining District), Gunnison County, Colorado, USA
33.1km (20.6 miles) ⓘCalifornia Mine, Upper Browns Creek area, Nathrop, Chaffee County, Colorado, USA
35.4km (22.0 miles) ⓘUnnamed Uranium - Feldspar Mine (MRDS - 10013132), Saguache County, Colorado, USA
46.9km (29.1 miles) ⓘLittle Johnnie Mine (Cathey Nos. 1-5; Unpatented Claims: Little Johnnie Nos. 1-2; Charley Nos. 1-5; Little Johnnie Extension), Goose Creek Mining District, Gunnison County, Colorado, USA
References
King, Van (n.d.) Personal communcation.
 
and/or  
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