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
Granite Mountain No. 3 Quarry, Sweet Home, Granite Mountain complex, Saline County, Arkansas, 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
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Heulandite Subgroup data
Locality Data:Click here to view Granite Mountain No. 3 Quarry, Sweet Home, Granite Mountain complex, Saline County, Arkansas, USA
Data Identifiers
Mindat Occurrence Record ID:423896
Long-form Identifier:1:3:423896:6
GUID (UUID V4):0
Nearest other occurrences of Heulandite Subgroup
20.7km (12.9 miles) ⓘBig Rock Quarry (3M Quarry; Arch Street Pike Quarry), Granite Mountain area, Little Rock, Pulaski County, Arkansas, USA
22.6km (14.0 miles) ⓘGranite Mountain Quarry No. 1, Granite Mountain Area, Little Rock, Pulaski County, Arkansas, USA
36.7km (22.8 miles) ⓘUnion Carbide Christy Vanadium Mine, Magnet Cove, Hot Spring County, Arkansas, USA
38.6km (24.0 miles) ⓘJones Mill Quarry, Magnet Cove, Hot Spring County, Arkansas, USA
References
Tschernich, Rudy W. (1992) Zeolites of the World. Geoscience Press, Inc. 567pp.
 
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