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


04947980017363412607990.jpg
Diopside

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
01131370017272015844701.jpg
Diopside, etc.

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
08582620017272015861395.jpg
Diopside, etc.

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
07398810017363412609158.jpg
Diopside, etc.

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
04947980017363412607990.jpg
Diopside

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
00230880017363412619927.jpg
Diopside, etc.

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
03051390017363412616161.jpg
Diopside, etc.

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
07398810017363412609158.jpg
Diopside, etc.

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
05598530017363412617767.jpg
Diopside

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
01131370017272015844701.jpg
Diopside, etc.

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
08582620017272015861395.jpg
Diopside, etc.

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
06559990017363412614353.jpg
Diopside, etc.

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
Locality type:Mine
Classification
Species:Diopside
Formula:CaMgSi2O6
Comments:Reported as crystals in pyrrhotite, dolomite, calcite, and gneiss; also in green granular and crystalline masses
Also found as stout pink crystals on serpentine and as micro lath-like crystals, transparent, and embedded in a matrix of white calcite.
Colour:green, pink
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Chondrodite6
Calcite5
Clinochlore2
Magnetite2
Serpentine Subgroup1
Arsenopyrite1
Actinolite1
Pyrite1
Data
Mineral Data:Click here to view Diopside data
Locality Data:Click here to view Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
Photo GalleryView Gallery (6 photos)
Data Identifiers
Mindat Occurrence Record ID:100231
Long-form Identifier:1:3:100231:7
GUID (UUID V4):0
Nearest other occurrences of Diopside
1.9km (1.2 miles) ⓘInterstate 84 road cuts, Town of Southeast, Putnam County, New York, USA
15.5km (9.6 miles) ⓘNorth Street mall, Danbury, Fairfield County, Connecticut, USA
17.8km (11.1 miles) ⓘOld Quarry Nature Center, Danbury, Fairfield County, Connecticut, USA
19.2km (12.0 miles) ⓘAgstone Company Limestone Quarry, Danbury, Fairfield County, Connecticut, USA
19.8km (12.3 miles) ⓘWest Redding grossular locality, Redding, Fairfield County, Connecticut, USA
21.0km (13.1 miles) ⓘU. S. Route 7 Expressway (Danbury line to Iron Works District), Brookfield, Fairfield County, Connecticut, USA
22.3km (13.9 miles) ⓘHustis Quarry, Town of Philipstown, Putnam County, New York, USA
22.9km (14.2 miles) ⓘShaft 7, Delaware Aqueduct, Town of Fishkill, Dutchess County, New York, USA
25.7km (16.0 miles) ⓘPhilipstown, Cold Spring, Town of Philipstown, Putnam County, New York, USA
26.3km (16.4 miles) ⓘAdvance Stone Quarry, Boardman's Bridge, New Milford, Litchfield County, Connecticut, USA
References
(Januzzi, 1966, 1989) (Trainer, 1938) (Nightingale 2001)
Jensen (1978) Minerals of New York State, pp.42-43
 
and/or  
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