Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Serpentine Subgroup from
Cotopaxi Mine (Cotopaxi lode; Gumaer Mine; Fannie lode; Fannie Mill), Mine Gulch, Cotopaxi, Cotopaxi Mining District, Fremont County, Colorado, USA


Locality type:Mine
Classification
Species:'Serpentine Subgroup' (not an IMA approved species)
Formula:D3[Si2O5](OH)4
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Serpentine Subgroup data
Locality Data:Click here to view Cotopaxi Mine (Cotopaxi lode; Gumaer Mine; Fannie lode; Fannie Mill), Mine Gulch, Cotopaxi, Cotopaxi Mining District, Fremont County, Colorado, USA
Data Identifiers
Mindat Occurrence Record ID:509587
Long-form Identifier:1:3:509587:2
GUID (UUID V4):0
Nearest other occurrences of Serpentine Subgroup
18.3km (11.4 miles) ⓘVermiculite Mine (MRDS - 10013422), Gem Park complex, Fremont County, Colorado, USA
34.4km (21.4 miles) ⓘDawson Gold project, Fremont County, Colorado, USA
41.1km (25.6 miles) ⓘJohn Spalding Occurrence (Spaulding), Custer County, Colorado, USA
54.9km (34.1 miles) ⓘTaylor Gulch, Monarch Mining District, Chaffee County, Colorado, USA
61.9km (38.5 miles) ⓘAnnie Hudson, Tomichi Mining District (White Pine Mining District), Gunnison County, Colorado, USA
61.9km (38.5 miles) ⓘIron King, Tomichi Mining District (White Pine Mining District), Gunnison County, Colorado, USA
65.2km (40.5 miles) ⓘStella Mountain, Tomichi Mining District (White Pine Mining District), Gunnison County, Colorado, USA
65.2km (40.5 miles) ⓘStella Mountain, Monarch Mining District, Chaffee County, Colorado, USA
74.6km (46.4 miles) ⓘGeneva Claim (1), Monarch Mining District, Chaffee County, Colorado, USA
76.0km (47.2 miles) ⓘCumberland; Sinbad; York; Deadlock; Michigan Occurrence, Tincup Mining District (Pieplant Mining District), Gunnison County, Colorado, USA
References
Am Min 50:1179-1212
 
and/or  
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