Sinkankasite, mineral formula: , was named after

John Sinkankas John Sinkankas (May 15, 1915 – May 17, 2002) was a Navy officer and aviator, gemologist, gem carver and gem faceter, author of many books and articles on minerals and gemstones, and a bookseller and bibliographer of rare books. Early life John ...

(1915–2002), noted author and mineral collector,

Scripps Institute of Oceanography The Scripps Institution of Oceanography (sometimes referred to as SIO, Scripps Oceanography, or Scripps) in San Diego, California, US founded in 1903, is one of the oldest and largest centers for ocean and Earth science research, public serv ...

. It is triclinic; as colorless, bladed to prismatic crystals up to 4 mm in length, often as divergent, radial aggregates and as

pseudomorph In mineralogy, a pseudomorph is a mineral or mineral compound that appears in an atypical form (crystal system), resulting from a substitution process in which the appearance and dimensions remain constant, but the original mineral is replaced by ...

s after triphlyte crystals; occurs in the Barker pegmatite (formerly Ferguson pegmatite), east of

Keystone, South Dakota Keystone is a town in the Black Hills region of Pennington County, South Dakota, United States. The population was 240 at the 2020 census. It had its origins in 1883 as a mining town, and has since transformed itself into a resort town, serving ...

, and in the Palermo pegmatite, North Groton, New Hampshire.Mitchelll, Richard S. 1986. "Who's Who in Mineral Names; John Sinkankas." Rocks and Minerals. Volume 61 (1), page 28.

References

Phosphate minerals Triclinic minerals Minerals in space group 2 {{Phosphate-mineral-stub