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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Quartz 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:Quartz
Formula:SiO2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Quartz 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:149190
Long-form Identifier:1:3:149190:6
GUID (UUID V4):0
Nearest other occurrences of Quartz
0.3km (0.2 miles) ⓘCotopaxi Mining District, Fremont County, Colorado, USA
3.5km (2.2 miles) ⓘCotopaxi Pegmatite area, Cotopaxi, Cotopaxi Mining District, Fremont County, Colorado, USA
3.8km (2.4 miles) ⓘMcCoy prospects, Cotopaxi Pegmatite area, Cotopaxi, Cotopaxi Mining District, Fremont County, Colorado, USA
4.1km (2.6 miles) ⓘJones & Young Lease, Pleasanton Area, Fremont County, Colorado, USA
4.5km (2.8 miles) ⓘWest McCoy Gulch Property, Cotopaxi Mining District, Fremont County, Colorado, USA
4.6km (2.9 miles) ⓘCarson Mining Company Prospect, Cotopaxi Mining District, Fremont County, Colorado, USA
4.9km (3.0 miles) ⓘCotopaxi Feldspar Mine (Cotopaxi Feldspar prospect; Henry pegmatite), Cotopaxi Pegmatite area, Cotopaxi, Cotopaxi Mining District, Fremont County, Colorado, USA
5.0km (3.1 miles) ⓘCotopaxi prospect (Sand Gulch prospect), Cotopaxi, Cotopaxi Mining District, Fremont County, Colorado, USA
5.1km (3.2 miles) ⓘSand Gulch Prospect No. 2, Cotopaxi Mining District, Fremont County, Colorado, USA
5.9km (3.7 miles) ⓘColorado Feldspar Pegmatite, Cotopaxi Mining District, Fremont County, Colorado, USA
References
Am Min 50:1179-1212
USGS Prof Paper 223
Pearl, Richard M. (1958) Colorado Gem Trails and Mineral Guide (1st ed.) Sage Books, Denver, CO.
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
 
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