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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Diopside 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:Diopside
Formula:CaMgSi2O6
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Diopside 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:34968
Long-form Identifier:1:3:34968:0
GUID (UUID V4):0
Nearest other occurrences of Diopside
14.1km (8.7 miles) ⓘDevil's Hole Mine, Fremont County, Colorado, USA
23.2km (14.4 miles) ⓘJack of Diamonds Prospect, McIntyre Hills Area, 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
26.9km (16.7 miles) ⓘGypse Queen Mine, Cleora Mining District, Chaffee County, Colorado, USA
27.5km (17.1 miles) ⓘStockton Mine (Gertrude Vein), Cleora Mining District, Chaffee County, Colorado, USA
27.8km (17.3 miles) ⓘMorning Star Claims 1943, McIntyre Gulch Area, Fremont County, Colorado, USA
32.0km (19.9 miles) ⓘFour Claim Group, Currant Creek Area, Guffey Mining District (Freshwater Mining District), Fremont County, Colorado, USA
35.8km (22.3 miles) ⓘPoncha Pass Claim (3 Claims; Lucky Nos. 1), Poncha Pass Area, Chaffee County, Colorado, USA
35.9km (22.3 miles) ⓘCalumet Mine, Turret Mining District, Chaffee County, Colorado, USA
38.1km (23.7 miles) ⓘSedalia Mine (Sedalia Copper Mine), Sedalia Mining District, Chaffee County, Colorado, USA
References
Am Min 50:1179-1212
Eckel, Edwin Butt; Cobban, Robert R.; Mosburg, Shirley K.; Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
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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