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


03464720017363383776401.jpg
Gypsum, etc.

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
08636980017272016396867.jpg
Gypsum

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
09102470017272016368508.jpg
Gypsum, etc.

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
03810210017368138739590.jpg
Gypsum, etc.

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
03464720017363383776401.jpg
Gypsum, etc.

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
09981800017272052021869.jpg
Gypsum

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
05238890017272052028108.jpg
Gypsum, etc.

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
03810210017368138739590.jpg
Gypsum, etc.

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
09458380017368138739979.jpg
Gypsum, etc.

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
08636980017272016396867.jpg
Gypsum

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
09102470017272016368508.jpg
Gypsum, etc.

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
05935870017368138748295.jpg
Gypsum, etc.

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
Locality type:Mine
Classification
Species:Gypsum
Formula:CaSO4 · 2H2O
Comments:Small, colorless "lath-like" crystals and crystal aggregates occur in gneiss
Also found associated with other sulfates within the ore body.
Colour:colorless
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Clinochlore2
Magnetite2
Brochantite2
Data
Mineral Data:Click here to view Gypsum data
Locality Data:Click here to view Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
Photo GalleryView Gallery (3 photos)
Data Identifiers
Mindat Occurrence Record ID:100217
Long-form Identifier:1:3:100217:1
GUID (UUID V4):0
Nearest other occurrences of Gypsum
1.9km (1.2 miles) ⓘInterstate 84 road cuts, Town of Southeast, Putnam County, New York, USA
8.1km (5.0 miles) ⓘPutnam County Mining Corp. Mine, Pine Pond, Town of Kent, Putnam County, New York, USA
19.2km (12.0 miles) ⓘAgstone Company Limestone Quarry, Danbury, Fairfield County, Connecticut, USA
23.6km (14.6 miles) ⓘSky Ridge railroad cut, Hawleyville, Newtown, Fairfield County, Connecticut, USA
27.6km (17.1 miles) ⓘPhilips Mine (Philips Pyrite Mine; Anthony's Nose Pyrrhotite Mine), Town of Philipstown, Putnam County, New York, USA
30.1km (18.7 miles) ⓘGreen's Farm locality (Roxbury garnet mine; Roxbury Falls garnet mine; Garnet Hill), Roxbury, Litchfield County, Connecticut, USA
34.1km (21.2 miles) ⓘForest of Dean Mine, Fort Montgomery, Town of Highlands, Orange County, New York, USA
36.7km (22.8 miles) ⓘState Route 111 road cuts, Long Hill, Trumbull, Fairfield County, Connecticut, USA
36.9km (22.9 miles) ⓘOld Mine Plaza construction site, Long Hill, Trumbull, Fairfield County, Connecticut, USA
37.2km (23.1 miles) ⓘO & G Southbury Quarry (Silliman Quarry; O & G No. 2 Quarry), Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA
References
(Januzzi, 1966, 1989) (Trainer, 1938) (Nightingale 2001)
Jensen (1978) Minerals of New York State, 42-43
 
and/or  
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