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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Galena 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:Galena
Formula:PbS
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Galena 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:59334
Long-form Identifier:1:3:59334:2
GUID (UUID V4):0
Nearest other occurrences of Galena
0.3km (0.2 miles) ⓘCotopaxi Mining District, Fremont County, Colorado, USA
14.0km (8.7 miles) ⓘRoad Gulch, Fremont County, Colorado, USA
14.4km (9.0 miles) ⓘHomestake No. 2 Claim (Homestake No. 6; Homestake Claims), Fremont County, Colorado, USA
14.5km (9.0 miles) ⓘDreamers Hope Claim, Fremont County, Colorado, USA
16.3km (10.1 miles) ⓘCloverdale Mine (Cloverdale Tunnel), Rainbow Lake Mining District, Lake Creek Mining District, Custer County, Colorado, USA
17.7km (11.0 miles) ⓘSteele Canyon Mining; Milling; and Investment Company Claims (Independence; Victor; Princess), Blake Mining District (Mirage Mining District; Cotton Creek Mining District), Saguache County, Colorado, USA
18.7km (11.6 miles) ⓘNo Name Lead Mine, Hayden Pass Area, Saguache County, Colorado, USA
23.3km (14.5 miles) ⓘPine Creek drainage (Pine Gulch), Gem Park complex, Fremont County, Colorado, USA
26.6km (16.6 miles) ⓘGreen Mountain Mine (Copper Boy Mine), Grape Creek Mining District (Greenhorn Mining District), Fremont County, Colorado, USA
28.8km (17.9 miles) ⓘAmethyst carbonatite, McClure Mountain Complex, Fremont County, Colorado, USA
References
Dana 7:I:695.
Am Min 50:1179-1212
USGS Prof Paper 223
The Canadian Mineralogist Vol. 43, pp. 601-622 (2005)
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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