Tags: Chemical Substance, Mineral.
Sinkankasite mineral formula: H2MnAl(PO4)2(OH)·6H2O 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.
