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
Brandywine Quarry (Hubbard Quarry), Wilmington, New Castle County, Delaware, USA


Locality type:Quarry
Classification
Species:Marcasite
Formula:FeS2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Marcasite data
Locality Data:Click here to view Brandywine Quarry (Hubbard Quarry), Wilmington, New Castle County, Delaware, USA
Data Identifiers
Mindat Occurrence Record ID:50043
Long-form Identifier:1:3:50043:0
GUID (UUID V4):0
Nearest other occurrences of Marcasite
41.3km (25.7 miles) ⓘEcton Mine, Perkiomen Mines, Audubon, Lower Providence Township, Montgomery County, Pennsylvania, USA
68.2km (42.4 miles) ⓘOley Valley Quarry (Oley Stone Quarry; Eastern Industries Quarry), Oley Township, Berks County, Pennsylvania, USA
83.0km (51.6 miles) ⓘTrap Rock Industries Moores Station Quarry, Moore, Hopewell Township, Mercer County, New Jersey, USA
88.3km (54.9 miles) ⓘUeberroth Mine, Friedensville, Upper Saucon Township, Lehigh County, Pennsylvania, USA
91.0km (56.5 miles) ⓘCornwall Mines (Cornwall Iron Mine), Cornwall Borough (Cornwall), Lebanon County, Pennsylvania, USA
References
Rocks & Min.:11:216
21:280-281
AmMin:9(1924):1-5.
 
and/or  
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