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
Mount Roosevelt, Middle Fork of the Snoqualmie River, Snoqualmie Mining District, King County, Washington, USA


Locality type:Mountain
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 Mount Roosevelt, Middle Fork of the Snoqualmie River, Snoqualmie Mining District, King County, Washington, USA
Data Identifiers
Mindat Occurrence Record ID:192200
Long-form Identifier:1:3:192200:4
GUID (UUID V4):0
Nearest other occurrences of Heulandite Subgroup
31.4km (19.5 miles) ⓘRaging River Quarry, King County, Washington, USA
40.7km (25.3 miles) ⓘYoungs Creek Quarry, Snohomish County, Washington, USA
41.2km (25.6 miles) ⓘForest Service Road 70, King County, Washington, USA
64.6km (40.1 miles) ⓘOld Blewett Highway Roadcuts, Blewett Mining District (Peshastin Mining District), Chelan County, Washington, USA
66.4km (41.2 miles) ⓘGolden Fleece Mine (Mercer Mine; T-Bone Mine), Liberty, Swauk Mining District, Kittitas County, Washington, USA
References
Tschernich, Rudy W. (1992) Zeolites of the World. Geoscience Press, Inc. 567pp.
 
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