Sinkankasite

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Sinkankasite
Sinkankasite-d06-09a.jpg
General
CategoryPhosphate mineral
Formula
(repeating unit)
H
2
MnAl(PO
4
)
2
(OH)·6H
2
O
Strunz classification8.DB.20
Crystal systemTriclinic
Crystal classPinacoidal (1)
(same H-M symbol)
Space groupP1
Identification
ColorColorless
Mohs scale hardness4
LusterVitreous
DiaphaneityTransparent
References[1][2]

Sinkankasite, mineral formula: H
2
MnAl(PO
4
)
2
(OH)·6H
2
O
, 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[edit]

  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.