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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Heulandite Subgroup from
Pine Rock Quarry (Farnham Quarry), Hamden, New Haven County, Connecticut, USA


Locality type:Quarry
Classification
Species:'Heulandite Subgroup' (not an IMA approved species)
Formula:(Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O
Comments:small colorless and large fleshy red rhombs.
Habit:rhombohedral
Colour:colorless to fleshy red
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Heulandite Subgroup data
Locality Data:Click here to view Pine Rock Quarry (Farnham Quarry), Hamden, New Haven County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:780337
Long-form Identifier:1:3:780337:6
GUID (UUID V4):0
Nearest other occurrences of Heulandite Subgroup
20.0km (12.4 miles) ⓘCheshire Traprock Quarry, Cheshire, New Haven County, Connecticut, USA
23.9km (14.9 miles) ⓘOld Mine Plaza construction site, Long Hill, Trumbull, Fairfield County, Connecticut, USA
24.8km (15.4 miles) ⓘNew England Materials quarry, Monroe, Fairfield County, Connecticut, USA
25.9km (16.1 miles) ⓘHubbard Park Quartz locality, Meriden, New Haven County, Connecticut, USA
29.0km (18.0 miles) ⓘRoute 73 quarry, Waterbury, New Haven County, Connecticut, USA
29.5km (18.3 miles) ⓘO & G Southbury Quarry (Silliman Quarry; O & G No. 2 Quarry), Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA
30.0km (18.6 miles) ⓘBlue Stone Quarry, Waterbury, New Haven County, Connecticut, USA
30.5km (19.0 miles) ⓘInterstate 95 exit 24, Fairfield, Fairfield County, Connecticut, USA
30.8km (19.1 miles) ⓘState Route 8 interchange 34 (formerly 37), Watertown, Litchfield County, Connecticut, USA
32.1km (19.9 miles) ⓘNonnewaug River Industrial Park, Woodbury, Litchfield County, Connecticut, USA
References
Schairer, John F. (1931): Minerals of Connecticut. State Geological and Natural History Survey Bulletin 51.
 
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