Quintinte-1M from the Mariinsky Deposit, Ural emerald mines (Russia)

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Marco E. Ciriotti
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Quintinte-1M from the Mariinsky Deposit, Ural emerald mines (Russia)

Messaggio da Marco E. Ciriotti » gio 15 mar, 2018 9:32

▪ Zhitova, E.S., Popov, M.P., Krivovichev, S.V., Zaitsev, A.N., Vlasenko, N,S. (2018): Quintinite-1M from the Mariinsky Deposit, Ural Emerald Mines, Central Urals, Russia. Geology of Ore Deposits, 59, 745-751.

The paper describes the first finding of quintinite [Mg4Al2(OH)12][(CO3)(H2O)3] at the Mariinsky deposit in the Central Urals, Russia. The mineral occurs as white tabular crystals in cavities within altered gabbro in association with prehnite, calcite, and a chlorite-group mineral. Quintinite is the probable result of late hydrothermal alteration of primary mafic and ultramafic rocks hosting emerald-bearing glimmerite. According to electron microprobe data, the Mg : Al ratio is ~2 : 1. IR spectroscopy has revealed hydroxyl and carbonate groups and H2O molecules in the mineral. According to single crystal XRD data, quintinite is monoclinic, space group C2/m, a =5.233(1), b = 9.051(2), c = 7.711(2) Å, β = 103.09(3)°, V = 355.7(2) Å3. Based on structure refinement, the polytype of quintinite should be denoted as 1M. This is the third approved occurrence of quintinite-1M in the world after the Kovdor complex and Bazhenovsky chrysotile–asbestos deposit.
Marco E. Ciriotti

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