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
Two Brothers Tunnel, Idaho Springs Mining District (Virginia Mining District), Clear Creek County, Colorado, USA


Locality type:Tunnel
Classification
Species:Marcasite
Formula:FeS2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Marcasite data
Locality Data:Click here to view Two Brothers Tunnel, Idaho Springs Mining District (Virginia Mining District), Clear Creek County, Colorado, USA
Data Identifiers
Mindat Occurrence Record ID:608977
Long-form Identifier:1:3:608977:1
GUID (UUID V4):0
Nearest other occurrences of Marcasite
3.3km (2.1 miles) ⓘWest Calhoun Mine, Calhoun-Wood Mines (Jefferson), Central City Mining District (Central Mining District), Gilpin County, Colorado, USA
3.8km (2.4 miles) ⓘMary Mine, Lawson Mining District, Clear Creek County, Colorado, USA
5.2km (3.2 miles) ⓘMayflower, Idaho Springs Mining District (Virginia Mining District), Clear Creek County, Colorado, USA
6.7km (4.2 miles) ⓘBeaver Incline, Lamartine Mining District, Clear Creek County, Colorado, USA
8.4km (5.2 miles) ⓘDorit - King Solomon Tunnel (King Solomon), Lamartine Mining District, Clear Creek County, Colorado, USA
11.7km (7.3 miles) ⓘDixie Mine, Lamartine Mining District, Clear Creek County, Colorado, USA
12.0km (7.5 miles) ⓘHumboldt et al Claims, Cascade, Chicago Creek, Clear Creek County, Colorado, USA
12.2km (7.6 miles) ⓘCharter Oak Prospect (Tyone), Chicago Creek, Clear Creek County, Colorado, USA
12.2km (7.6 miles) ⓘHenry Wilson, Lamartine Mining District, Clear Creek County, Colorado, USA
12.8km (7.9 miles) ⓘMohawk, Chicago Creek, Clear Creek County, Colorado, USA
References
Moench, Robert Hadley, Drake, Avery Ala (1966) Mines and Prospects, Idaho Springs District, Clear Creek and Gilpin Counties, Colorado - Descriptions and Maps. Open-File Report Vol. 1966 (66-87) US Geological Survey doi:10.3133/ofr6687
 
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