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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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Gypsum from
Agstone Company Limestone Quarry, Danbury, Fairfield County, Connecticut, USA


07711020017272051763347.jpg
Gypsum

Agstone Company Limestone Quarry, Danbury, Fairfield County, Connecticut, USA
08727380017362972525963.jpg
Gypsum

Agstone Company Limestone Quarry, Danbury, Fairfield County, Connecticut, USA
07579970017362972531639.jpg
Gypsum

Agstone Company Limestone Quarry, Danbury, Fairfield County, Connecticut, USA
07711020017272051763347.jpg
Gypsum

Agstone Company Limestone Quarry, Danbury, Fairfield County, Connecticut, USA
08727380017362972525963.jpg
Gypsum

Agstone Company Limestone Quarry, Danbury, Fairfield County, Connecticut, USA
07579970017362972531639.jpg
Gypsum

Agstone Company Limestone Quarry, Danbury, Fairfield County, Connecticut, USA
07711020017272051763347.jpg
Gypsum

Agstone Company Limestone Quarry, Danbury, Fairfield County, Connecticut, USA
08727380017362972525963.jpg
Gypsum

Agstone Company Limestone Quarry, Danbury, Fairfield County, Connecticut, USA
07579970017362972531639.jpg
Gypsum

Agstone Company Limestone Quarry, Danbury, Fairfield County, Connecticut, USA
Locality type:Quarry
Classification
Species:Gypsum
Formula:CaSO4 · 2H2O
Comments:Micro secondary crystals from the reaction of pyrite, calcite and water and "found as seams in limestone associated with calcite at the limestone quarry, Beaver Brook District, Danbury" Januzzi (1959). Schooner (1961) reports seeing a good example.
Habit:micro plumose aggregates
Colour:colorless but typically stained yellow
Quality for species:Poor for species, only of interest for locality collectors. (#)
Abundance at site:Common
Confirmation
Validity:Confirmed
Confirmation Methods:Visually Identified
Data
Mineral Data:Click here to view Gypsum data
Locality Data:Click here to view Agstone Company Limestone Quarry, Danbury, Fairfield County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:987452
Long-form Identifier:1:3:987452:7
GUID (UUID V4):0
Nearest other occurrences of Gypsum
4.4km (2.7 miles) ⓘSky Ridge railroad cut, Hawleyville, Newtown, Fairfield County, Connecticut, USA
12.7km (7.9 miles) ⓘGreen's Farm locality (Roxbury garnet mine; Roxbury Falls garnet mine; Garnet Hill), Roxbury, Litchfield County, Connecticut, USA
17.3km (10.8 miles) ⓘInterstate 84 road cuts, Town of Southeast, Putnam County, New York, USA
18.9km (11.8 miles) ⓘO & G Southbury Quarry (Silliman Quarry; O & G No. 2 Quarry), Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA
19.2km (12.0 miles) ⓘTilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
21.5km (13.3 miles) ⓘOld Mine Plaza construction site, Long Hill, Trumbull, Fairfield County, Connecticut, USA
21.5km (13.3 miles) ⓘState Route 111 road cuts, Long Hill, Trumbull, Fairfield County, Connecticut, USA
21.8km (13.6 miles) ⓘOld Mine Park (Old Tungsten Mine), Long Hill, Trumbull, Fairfield County, Connecticut, USA
25.1km (15.6 miles) ⓘPutnam County Mining Corp. Mine, Pine Pond, Town of Kent, Putnam County, New York, USA
28.2km (17.5 miles) ⓘBarrett Brothers Quarry (D and J Quarry), Beacon Falls, New Haven County, Connecticut, USA
References
Januzzi, Ronald (1959) The Minerals of Western Connecticut and Southeastern New York State.. The Mineralogical Press, Danbury, Connecticut.
Ryerson, Kathleen H. (1972): Rock Hound's Guide to Connecticut. Pequot Press.
Januzzi, Ron E., Seaman, David M. (1976) Mineral Localities of Connecticut and Southeastern New York State and Pegmatite Minerals of the World. The Mineralogical Press, Danbury, Connecticut, USA.
 
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