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
Peerless Mine, Keystone, Keystone Mining District, Pennington County, South Dakota, 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 Peerless Mine, Keystone, Keystone Mining District, Pennington County, South Dakota, USA
Data Identifiers
Mindat Occurrence Record ID:212448
Long-form Identifier:1:3:212448:3
GUID (UUID V4):0
Nearest other occurrences of Marcasite
24.9km (15.5 miles) ⓘSouth Dakota State Cement Plant, Unorganized mining district [5], Pennington County, South Dakota, USA
27.9km (17.4 miles) ⓘTip Top Mine, Fourmile, Custer Mining District, Custer County, South Dakota, USA
36.5km (22.7 miles) ⓘKing of the West (North Star), Rochford Mining District, Pennington County, South Dakota, USA
52.1km (32.4 miles) ⓘDouble Rainbow Mine, Galena, Galena Mining District, Lawrence County, South Dakota, USA
58.2km (36.1 miles) ⓘBelle Eldridge Gold Mine (Deadwood Lead and Zinc Company Mine; Helen Gould Claim), Deadwood, Galena Mining District, Lawrence County, South Dakota, USA
63.3km (39.3 miles) ⓘMaitland Mine (Realization Mine; Penobscot Mine - Lawrence County; Garden City; Keystone), Garden Mining District (Maitland Mining District), Lawrence County, South Dakota, USA
64.8km (40.3 miles) ⓘRunge Mine, Edgemont Uranium Mining District, Fall River County, South Dakota, USA
83.3km (51.8 miles) ⓘElk Creek, Meade County, South Dakota, USA
95.6km (59.4 miles) ⓘOrman Dam, Belle Fourche, Belle Fourche Mining District, Butte County, South Dakota, USA
References
Smith, Arthur E., Fritzsch, Eric (2000) SOUTH DAKOTA. Rocks & Minerals, 75 (3) 156-169 doi:10.1080/00357520009605635
 
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