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Sinkankasite
General
Category	Phosphate mineral
Formula (repeating unit)	H 2MnAl(PO 4) 2(OH)·6H 2O
IMA symbol	Ska
Strunz classification	8.DB.20
Crystal system	Triclinic
Crystal class	Pinacoidal (1) (same H-M symbol)
Space group	P1
Identification
Color	Colorless
Mohs scale hardness	4
Luster	Vitreous
Diaphaneity	Transparent
References

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

1. Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
2. Mineralienatlas
3. Mindat
4. Burns P C, Hawthorne F C. 1995. "Sinkankasite." American Mineralogist, 80 (1995) p.620-627.
5. Mitchelll, Richard S. 1986. "Who's Who in Mineral Names; John Sinkankas." Rocks and Minerals. Volume 61 (1), page 28.

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