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
Reed's Gap Quarry (New Haven Trap Rock quarry; Tilcon Durham quarry), Durham, Middlesex County, Connecticut, USA


Locality type:Quarry
Classification
Species:Gypsum
Formula:CaSO4 · 2H2O
Confirmation
Validity:Confirmed
Confirmation Methods:Visually Identified
Data
Mineral Data:Click here to view Gypsum data
Locality Data:Click here to view Reed's Gap Quarry (New Haven Trap Rock quarry; Tilcon Durham quarry), Durham, Middlesex County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:1012602
Long-form Identifier:1:3:1012602:4
GUID (UUID V4):0
Nearest other occurrences of Gypsum
11.5km (7.1 miles) ⓘMeriden Trap Rock Quarry (Lane's Quarry), Meriden, New Haven County, Connecticut, USA
11.7km (7.3 miles) ⓘPillow lava locality, Meriden, New Haven County, Connecticut, USA
16.9km (10.5 miles) ⓘCheshire Traprock Quarry, Cheshire, New Haven County, Connecticut, USA
18.1km (11.2 miles) ⓘStrickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
18.3km (11.4 miles) ⓘWorth and Selden Quarries (Victoria Quarry), East Hampton, Middlesex County, Connecticut, USA
18.6km (11.6 miles) ⓘGillette Quarry (J-J Mine; Haddam Neck Quarry), Haddam Neck, Haddam, Middlesex County, Connecticut, USA
19.1km (11.9 miles) ⓘState Forest Quarry No. 2, Cobalt, East Hampton, Middlesex County, Connecticut, USA
20.2km (12.6 miles) ⓘWalden Gem Quarry, Portland, Middlesex County, Connecticut, USA
20.6km (12.8 miles) ⓘSherrill Street quarry, New Britain, Hartford County, Connecticut, USA
21.3km (13.3 miles) ⓘProgress Lane construction site, Waterbury, New Haven County, Connecticut, USA
References
Sean Flanagan Specimen
 
and/or  
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