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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Gypsum from
Forest of Dean Mine, Fort Montgomery, Town of Highlands, Orange County, New York, USA


Locality type:Mine
Classification
Species:Gypsum
Formula:CaSO4 · 2H2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Gypsum data
Locality Data:Click here to view Forest of Dean Mine, Fort Montgomery, Town of Highlands, Orange County, New York, USA
Data Identifiers
Mindat Occurrence Record ID:79591
Long-form Identifier:1:3:79591:3
GUID (UUID V4):0
Nearest other occurrences of Gypsum
7.9km (4.9 miles) ⓘPhilips Mine (Philips Pyrite Mine; Anthony's Nose Pyrrhotite Mine), Town of Philipstown, Putnam County, New York, USA
11.5km (7.1 miles) ⓘNickel Mine (Bulson lot), Grape Swamp Mountain, Harriman State Park, Rockland County, New York, USA
30.6km (19.0 miles) ⓘPutnam County Mining Corp. Mine, Pine Pond, Town of Kent, Putnam County, New York, USA
34.1km (21.2 miles) ⓘTilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
36.0km (22.4 miles) ⓘInterstate 84 road cuts, Town of Southeast, Putnam County, New York, USA
36.4km (22.6 miles) ⓘBoston mine, Orange County, New York, USA
38.8km (24.1 miles) ⓘMidvale, Wanaque, Passaic County, New Jersey, USA
45.1km (28.0 miles) ⓘBraens Quarry, North Haledon, Passaic County, New Jersey, USA
46.6km (29.0 miles) ⓘProspect Park Quarry, Prospect Park, Passaic County, New Jersey, USA
47.7km (29.6 miles) ⓘBraen Quarry, Haledon, Passaic County, New Jersey, USA
References
Manchester, James G. (1931) The Minerals of New York City and its Environs. Bulletin of the New York Mineralogical Club Vol. 3 (1). New York Mineralogical Clubp.72
 
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