Home > Laskowski Ⅶ – August 10 > MS1936 Pokrovskite on Desautelsite
Pokrovskite on Desautelsite - Sold
- Hunting Hill quarry
- Rockville
- Maryland
- U.S.A.
- 3.2 × 2.6 × 1.4 cm – Thumbnail specimen (fits into a 2.5 cm cube)
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.
