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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Sillimanite from
Crugers Emery Mine, Montrose, Cortlandt Township, Westchester County, New York, USA


Locality type:Mine
Classification
Species:Sillimanite
Formula:Al2(SiO4)O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Sillimanite data
Locality Data:Click here to view Crugers Emery Mine, Montrose, Cortlandt Township, Westchester County, New York, USA
Data Identifiers
Mindat Occurrence Record ID:80895
Long-form Identifier:1:3:80895:2
GUID (UUID V4):0
Nearest other occurrences of Sillimanite
4.0km (2.5 miles) ⓘPeekskill, Westchester County, New York, USA
10.5km (6.5 miles) ⓘYorktown, Westchester County, New York, USA
23.6km (14.7 miles) ⓘVillage of Monroe, Town of Monroe, Orange County, New York, USA
43.0km (26.7 miles) ⓘOld Quarry Nature Center, Danbury, Fairfield County, Connecticut, USA
44.3km (27.5 miles) ⓘRedding Glen, Redding, Fairfield County, Connecticut, USA
49.1km (30.5 miles) ⓘU. S. Route 7 Expressway (Danbury line to Iron Works District), Brookfield, Fairfield County, Connecticut, USA
50.1km (31.1 miles) ⓘPochuck Mountain, McAfee, Vernon Township, Sussex County, New Jersey, USA
52.3km (32.5 miles) ⓘHamburg Mountain, Hardyston Township, Sussex County, New Jersey, USA
55.7km (34.6 miles) ⓘInterstate 84 road cuts (Route 6A bypass), Newtown, Fairfield County, Connecticut, USA
57.2km (35.6 miles) ⓘCopper Mine shaft, Edison Mine, Sparta Township, Sussex 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.70
 
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