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
Connecticut Yankee atomic power plant, Haddam Neck, Haddam, Middlesex County, Connecticut, USA


Classification
Species:'Heulandite Subgroup' (not an IMA approved species)
Formula:(Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O
Confirmation
Validity:Confirmed
Confirmation Methods:Visually Identified
Data
Mineral Data:Click here to view Heulandite Subgroup data
Locality Data:Click here to view Connecticut Yankee atomic power plant, Haddam Neck, Haddam, Middlesex County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:887247
Long-form Identifier:1:3:887247:0
GUID (UUID V4):0
Nearest other occurrences of Heulandite Subgroup
10.0km (6.2 miles) ⓘHadlyme, Lyme, New London County, Connecticut, USA
28.5km (17.7 miles) ⓘHubbard Park Quartz locality, Meriden, New Haven County, Connecticut, USA
28.6km (17.8 miles) ⓘ2368-2384 Berlin Turnpike (Former Hartford Drive-In), Newington, Hartford County, Connecticut, USA
29.7km (18.5 miles) ⓘState Route 9 - Ellis Street and State Route 72 interchanges (State Route 72 roadcut), New Britain, Hartford County, Connecticut, USA
32.9km (20.5 miles) ⓘUS Route 6 Willimantic Bypass expressway road cuts, Coventry, Tolland County, Connecticut, USA
35.7km (22.2 miles) ⓘCheshire Traprock Quarry, Cheshire, New Haven County, Connecticut, USA
41.0km (25.5 miles) ⓘPine Rock Quarry (Farnham Quarry), Hamden, New Haven County, Connecticut, USA
47.3km (29.4 miles) ⓘBecker Quarry, Willington, Tolland County, Connecticut, USA
47.6km (29.6 miles) ⓘBlue Stone Quarry, Waterbury, New Haven County, Connecticut, USA
49.1km (30.5 miles) ⓘState Route 8 interchange 34 (formerly 37), Watertown, Litchfield County, Connecticut, USA
References
Kevin Czaja Collection, Ex: Marcelle Weber Coll: m2405. 4-22-65
 
and/or  
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