Category Phosphate mineral Crystal system Triclinic | Strunz classification 8.DB.20 Space group P1 | |
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Formula(repeating unit) H2MnAl(PO4)2(OH)·6H2O Crystal class Pinacoidal (1)(same H-M symbol) | ||
Sinkankasite, mineral formula: H
2MnAl(PO
4)
2(OH)·6H
2O, was named after John Sinkankas (1915–2002), noted author and mineral collector, Scripps Institute of Oceanography. It is triclinic; as colorless, bladed to prismatic crystals up to 4 mm in length, often as divergent, radial aggregates and as pseudomorphs after triphlyte crystals; occurs in the Barker pegmatite (formerly Ferguson pegmatite), east of Keystone, South Dakota, and in the Palermo pegmatite, North Groton, New Hampshire.
References
Sinkankasite Wikipedia(Text) CC BY-SA