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Pokrovskite on Desautelsite - Sold

Pokrovskite is nominally a magnesium carbonate hydroxide, and a member of the rosasite group. Ivanov et al. (1984) named the mineral after Pavel Pokrovskii (1912-1979), mineralogist at the Institute of Geology and Geochemistry at Sverdlovsk, Russia. Pokrovskite analyses show excess water and deficient magnesium; pokrovskite charge balances excess hydrogen content with magnesium vacancies (Perchiazzi & Merlino, 2006).

Pokrovskite forms radiating sprays to 2 mm across on orange desautelsite. Pokrovskite from this locality is the subject of an article in the Mineralogical Record, March-April 1987. The matrix is altered rodingite. From the collection of E.R. Laskowski (1949-2020), a mining engineer who retired to Tucson, Arizona.