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Sinkankasite

Named after American author and bibliographer of mineral- and gem-related subjects as well as mineral artist, Dr. John Sinkankas. Found in just two localities worldwide, Sinkankasite is “a late-stage hydrothermal alteration product of triphylite in complex zoned granite pegmatites, and can be found at its type locality at the Baker-Ferguson mine here in the Black Hills, South Dakota and at the Palermo No.3 (or Palermo No.1, according to midat.org) mine in New Hampshire, USA.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/sinkankasite.pdf
- Formula
- Mn2+Al(PO3OH)2(OH)ยท6H2O
- Crystal System
- Triclinic
- Crystal Habit
- Pseudomorphous
- Cleavage
- Good, Parting, None
- Luster
- Vitreous - Dull
- Color
- colorless, white
- Streak
- white
- Class
- Triclinic - Pinacoidal
- Fracture
- Brittle
- Hardness
- 4
- WebMineral
- View Sinkankasite
- Mindat
- View Sinkankasite
Sinkankasite from Barker-Ferguson mine, Pennington Co., South Dakota, United States

White, thin bladed crystals to about 0.75mm in sprays in vugs.