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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Marcasite from
West Calhoun Mine, Calhoun-Wood Mines (Jefferson), Central City Mining District (Central Mining District), Gilpin County, Colorado, USA


Locality type:Mine
Classification
Species:Marcasite
Formula:FeS2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Marcasite data
Locality Data:Click here to view West Calhoun Mine, Calhoun-Wood Mines (Jefferson), Central City Mining District (Central Mining District), Gilpin County, Colorado, USA
Data Identifiers
Mindat Occurrence Record ID:665249
Long-form Identifier:1:3:665249:4
GUID (UUID V4):0
Nearest other occurrences of Marcasite
3.3km (2.1 miles) ⓘTwo Brothers Tunnel, Idaho Springs Mining District (Virginia Mining District), Clear Creek County, Colorado, USA
4.3km (2.7 miles) ⓘMayflower, Idaho Springs Mining District (Virginia Mining District), Clear Creek County, Colorado, USA
5.1km (3.2 miles) ⓘMary Mine, Lawson Mining District, Clear Creek County, Colorado, USA
6.4km (4.0 miles) ⓘBeaver Incline, Lamartine Mining District, Clear Creek County, Colorado, USA
7.6km (4.7 miles) ⓘDorit - King Solomon Tunnel (King Solomon), Lamartine Mining District, Clear Creek County, Colorado, USA
10.1km (6.3 miles) ⓘDixie Mine, Lamartine Mining District, Clear Creek County, Colorado, USA
10.3km (6.4 miles) ⓘHenry Wilson, Lamartine Mining District, Clear Creek County, Colorado, USA
10.3km (6.4 miles) ⓘHumboldt et al Claims, Cascade, Chicago Creek, Clear Creek County, Colorado, USA
10.6km (6.6 miles) ⓘCharter Oak Prospect (Tyone), Chicago Creek, Clear Creek County, Colorado, USA
11.1km (6.9 miles) ⓘMohawk, Chicago Creek, Clear Creek County, Colorado, USA
References
Sims, P.K. (1963) Geology of uranium and associated ore deposits, central part of the Front Range mineral belt, Colorado. Professional Paper 371. US Geological Survey doi:10.3133/pp371
 
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