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
Susaki, Chichi Island (Chichijima), Chichijima Group, Ogasawara Islands, Ogasawara Subprefecture, Tokyo Metropolis, Japan


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 Susaki, Chichi Island (Chichijima), Chichijima Group, Ogasawara Islands, Ogasawara Subprefecture, Tokyo Metropolis, Japan
Data Identifiers
Mindat Occurrence Record ID:575705
Long-form Identifier:1:3:575705:3
GUID (UUID V4):0
Nearest other occurrences of Heulandite Subgroup
2.1km (1.3 miles) ⓘSakaiura, Chichi Island (Chichijima), Chichijima Group, Ogasawara Islands, Ogasawara Subprefecture, Tokyo Metropolis, Japan
3.3km (2.1 miles) ⓘKita-hatsuneura (1), Chichi Island (Chichijima), Chichijima Group, Ogasawara Islands, Ogasawara Subprefecture, Tokyo Metropolis, Japan
3.3km (2.1 miles) ⓘOkumura, Chichi Island (Chichijima), Chichijima Group, Ogasawara Islands, Ogasawara Subprefecture, Tokyo Metropolis, Japan
3.4km (2.1 miles) ⓘMinami-hatsuneura, Chichi Island (Chichijima), Chichijima Group, Ogasawara Islands, Ogasawara Subprefecture, Tokyo Metropolis, Japan
3.5km (2.2 miles) ⓘMiyanohama, Chichi Island (Chichijima), Chichijima Group, Ogasawara Islands, Ogasawara Subprefecture, Tokyo Metropolis, Japan
4.0km (2.5 miles) ⓘNagasaki, Chichi Island (Chichijima), Chichijima Group, Ogasawara Islands, Ogasawara Subprefecture, Tokyo Metropolis, Japan
5.8km (3.6 miles) ⓘUguisu Beach, Ani Island (Anijima), Chichijima Group, Ogasawara Islands, Ogasawara Subprefecture, Tokyo Metropolis, Japan
References
Mineralogical Journal Vol. 11 (1982) , No. 1 pp1-14
 
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