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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Tourmaline 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:'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 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:34979
Long-form Identifier:1:3:34979:6
GUID (UUID V4):0
Nearest other occurrences of Tourmaline
13.2km (8.2 miles) ⓘHighway 50 roadcut, Texas Creek Area, Fremont County, Colorado, USA
14.2km (8.8 miles) ⓘJim 3 Mine, Lookout Mountain Area, Fremont County, Colorado, USA
14.3km (8.9 miles) ⓘHorsepasture Pegmatites Occurrence, Lookout Mountain Area, Fremont County, Colorado, USA
14.5km (9.0 miles) ⓘIlmenite Pegmatite Occurrence (MRDS - 10010868), Lookout Mountain Area, Fremont County, Colorado, USA
15.2km (9.5 miles) ⓘChief lithium pegmatite, Texas Creek Area, Fremont County, Colorado, USA
21.5km (13.4 miles) ⓘSpikebuck Mine, 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
33.6km (20.9 miles) ⓘConsolidated Feldspar Corporation Mine (Feldspar Corporation Mine), Eight Mile Park Pegmatite Mining District, Fremont 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.
 
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