Chemistry:Sinkankasite

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Sinkankasite
Sinkankasite-d06-09a.jpg
General
CategoryPhosphate mineral
Formula
(repeating unit)
H2MnAl(PO4)2(OH)·6H2O
Strunz classification8.DB.20
Crystal systemTriclinic
Crystal classPinacoidal (1)
(same H-M symbol)
Space groupP1
Identification
ColorColorless
Mohs scale hardness4
|re|er}}Vitreous
DiaphaneityTransparent
References[1][2]

Sinkankasite, mineral formula: H2MnAl(PO4)2(OH)·6H2O, was named after John Sinkankas (1915–2002), noted author and mineral collector, Scripps Institute of Oceanography.[4] 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.[5]

References

  1. Mineralienatlas
  2. Mindat
  3. Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode2021MinM...85..291W. https://www.cambridge.org/core/journals/mineralogical-magazine/article/imacnmnc-approved-mineral-symbols/62311F45ED37831D78603C6E6B25EE0A. 
  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.