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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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Thomsonite-Ca from
Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA


04326350017363644972735.jpg
Thomsonite-Ca

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
04326350017363644972735.jpg
Thomsonite-Ca

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
00810340017363644981845.jpg
Thomsonite-Ca

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
Locality type:Mine
Classification
Species:Thomsonite-Ca
Formula:NaCa2[Al5Si5O20] · 6H2O
Comments:Reported as white, radiating groups of columnar crystals, on gneiss
Habit:radiating columnar
Colour:white
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Thomsonite-Ca 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:100239
Long-form Identifier:1:3:100239:3
GUID (UUID V4):0
Nearest other occurrences of Thomsonite-Ca
27.0km (16.8 miles) ⓘPeekskill, Westchester County, New York, USA
68.9km (42.8 miles) ⓘProspect Park Quarry, Prospect Park, Passaic County, New Jersey, USA
72.4km (45.0 miles) ⓘUpper New Street Quarry, Paterson, Passaic County, New Jersey, USA
72.6km (45.1 miles) ⓘLower New Street Quarry, Paterson, Passaic County, New Jersey, USA
76.6km (47.6 miles) ⓘFrancisco Brothers Quarry, Great Notch, Little Falls Township, Passaic County, New Jersey, USA
82.7km (51.4 miles) ⓘDelaware - Lackawanna & Western Railroad tunnels, Bergen Hill, Jersey City, Hudson County, New Jersey, USA
85.2km (53.0 miles) ⓘMill site dump, Franklin Mine, Franklin, Sussex County, New Jersey, USA
85.6km (53.2 miles) ⓘFranklin Mine, Franklin, Sussex County, New Jersey, USA
88.6km (55.0 miles) ⓘPassaic pit (Marshall Mine; Passaic Mine), Sterling Hill, Ogdensburg, Sussex County, New Jersey, USA
References
(Januzzi, 1966, 1989) (Trainer, 1942).
Jensen (1978) Minerals of New York State, pp.42-43
 
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