Abstract—Chromceladonite in chromitites of the Southern Sarany chromium deposit (the Urals) occurs in two mineral associations: as crusts of acicular grains on uvarovite crystals and in thin-scale aggregates together with quartz and chlorite in brecciated zones developed after chromitites. The chemical composition of chromceladonite (wt %) is K2O 9.4, MgO 6.8, Cr2O3 17.1, SiO2 51.7, Al2O3 8.5, CaO 0.1, FeO 0.2, H2O+ 5.7. The sum is 99.7. Empirical formula: K0.82(Cr0.93Mg0.70 ⋅ Al0.25Ti0.05Fe0.01)Σ1.94[(Si3.56Al0.44)Σ4.00(O9.39OH0.61)Σ10(OH)2. Parameters of an elementary sell: a = 5.271(5), b = 9.015(6), c = 10.171(7) Å, β = 101.82(8)°, V = 475(1) Å3. The formation temperature of celadonite is as high as 300°C. A source of potassium for chromceladonite can be both country black shales and phlogopite-bearing rocks of the Southern Sarany massif.
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ACKNOWLEDGMENTS
We are grateful to I.V. Pekov for valuable remarks in manuscript preparation, the staff of the “Ural stone center” (Ekaterinburg), and personally F.M. Nurmukhametov for providing us with the material to study.
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Sustavov, S.G., Khanin, D.A. & Shagalov, E.S. Chromceladonite from the Southern Sarany Chromite Deposit (Northern Urals). Geol. Ore Deposits 61, 680–688 (2019). https://doi.org/10.1134/S1075701519070122
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DOI: https://doi.org/10.1134/S1075701519070122