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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Tetrahedrite 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:'Tetrahedrite Subgroup' (not an IMA approved species)
Formula:Cu6(Cu4C22+)Sb4S12S
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Tetrahedrite 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:355193
Long-form Identifier:1:3:355193:6
GUID (UUID V4):0
Nearest other occurrences of Tetrahedrite Subgroup
31.4km (19.5 miles) ⓘDakota Maid Prospect, Silver Cliff Mining District, Custer County, Colorado, USA
33.1km (20.6 miles) ⓘLady Franklin Mine, Silver Cliff Mining District, Custer County, Colorado, USA
33.1km (20.6 miles) ⓘP. D. Q. Shaft, Silver Cliff Mining District, Custer County, Colorado, USA
33.1km (20.6 miles) ⓘDefender Mine, Silver Cliff Mining District, Custer County, Colorado, USA
33.6km (20.9 miles) ⓘJay Gould Mine, Silver Cliff Mining District, Custer County, Colorado, USA
34.8km (21.7 miles) ⓘGeyser Mine (Security - Geyser), Silver Cliff Mining District, Custer County, Colorado, USA
39.4km (24.5 miles) ⓘEmpress Josephine Mine (Empress Josephine claim; Boss Mammoth claim), Bonanza, Bonanza Mining District (Kerber Creek Mining District; Blake Mining District), Saguache County, Colorado, USA
39.4km (24.5 miles) ⓘRawley Mine, Bonanza Mining District (Kerber Creek Mining District; Blake Mining District), Saguache County, Colorado, USA
41.8km (26.0 miles) ⓘPeerless Mine, Rosita Mining District, Custer County, Colorado, USA
42.0km (26.1 miles) ⓘBelcher prospect, Rosita Mining District, Custer County, Colorado, USA
References
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
 
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