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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Arsenopyrite from
Minnie Pump Shaft, Lake County, Colorado, USA


Locality type:Shaft
Classification
Species:Arsenopyrite
Formula:FeAsS
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Arsenopyrite data
Locality Data:Click here to view Minnie Pump Shaft, Lake County, Colorado, USA
Data Identifiers
Mindat Occurrence Record ID:659015
Long-form Identifier:1:3:659015:4
GUID (UUID V4):0
Nearest other occurrences of Arsenopyrite
1.0km (0.6 miles) ⓘTucson Mine, Iron Hill, Lake County, Colorado, USA
1.0km (0.6 miles) ⓘLeadville Deep Mines, Empire Gulch, Lake County, Colorado, USA
2.2km (1.4 miles) ⓘFirst National Mine, Printer Boy Hill, Leadville, Lake County, Colorado, USA
2.2km (1.4 miles) ⓘJulia Fisk Mine, Iowa Gulch, Leadville, Lake County, Colorado, USA
20.4km (12.7 miles) ⓘLing Mine, Upper Blue River Mining District, Park County, Colorado, USA
21.2km (13.2 miles) ⓘVictory Tunnel; Lucky Strike; Washington (Victory Mine; Victory-Lucky Strike), Kokomo-Tenmile area, Summit County, Colorado, USA
22.1km (13.7 miles) ⓘColonel Sellers Mine, Breene Mine (Aftermath; Whitequail; Badger; Milo; Delphose; Colonal Sellers; Wilfley-Kimberly), Kokomo-Tenmile area, Summit County, Colorado, USA
34.4km (21.4 miles) ⓘPercy Chester Mine, Gilman Mining District (Battle Mountain Mining District; Red Cliff Mining District), Eagle County, Colorado, USA
35.4km (22.0 miles) ⓘGilman Mining District (Battle Mountain Mining District; Red Cliff Mining District), Eagle County, Colorado, USA
35.4km (22.0 miles) ⓘEagle Mine, Gilman, Gilman Mining District (Battle Mountain Mining District; Red Cliff Mining District), Eagle County, Colorado, USA
References
Mineral Collector (1895) 1:168-169
 
and/or  
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