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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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Crocidolite from
Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA


07073120017363411157540.jpg
Crocidolite

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
07073120017363411157540.jpg
Crocidolite

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
07659070017363411166446.jpg
Crocidolite

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
Locality type:Mine
Classification
Species:Riebeckite Root Name Group var: Crocidolite
Formula:◻[Na2][Z32+Fe23+]Si8O22(OH,F,Cl)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Crocidolite data
Locality Data:Click here to view Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
Data Identifiers
Mindat Occurrence Record ID:100212
Long-form Identifier:1:3:100212:6
GUID (UUID V4):0
Nearest other occurrences of Crocidolite
99.3km (61.7 miles) ⓘMorristown occurrences, Morristown, Morris County, New Jersey, USA
References
Jensen (1978) Minerals of New York State, 42-43
 
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