Abstract
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.
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Original Russian Text © E.S. Zhitova, M.P. Popov, S.V. Krivovichev, A.N. Zaitsev, N.S. Vlasenko, 2016, published in Zapiski Rossiiskogo Mineralogicheskogo Obshchestva, 2016, No. 6, pp. 90–101.
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Zhitova, E.S., Popov, M.P., Krivovichev, S.V. et al. Quintinite-1M from the Mariinsky Deposit, Ural Emerald Mines, Central Urals, Russia. Geol. Ore Deposits 59, 745–751 (2017). https://doi.org/10.1134/S1075701517080116
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DOI: https://doi.org/10.1134/S1075701517080116