Sinkankasite

Sinkankasite
General
Category	Phosphate mineral
Formula; (repeating unit)	H; 2MnAl(PO; 4); 2(OH)·6H; 2O
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	[1][2]

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.[3] 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.[4]

References

Mineralienatlas
Mindat
Burns P C, Hawthorne F C. 1995. "Sinkankasite." American Mineralogist, 80 (1995) p.620-627.
Mitchelll, Richard S. 1986. "Who's Who in Mineral Names; John Sinkankas." Rocks and Minerals. Volume 61 (1), page 28.

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[1] Mineralienatlas

[2] Mindat

[3] Burns P C, Hawthorne F C. 1995. "Sinkankasite." American Mineralogist, 80 (1995) p.620-627.

[4] Mitchelll, Richard S. 1986. "Who's Who in Mineral Names; John Sinkankas." Rocks and Minerals. Volume 61 (1), page 28.