naa a22 4500 510736432 CHVBK 20180411083011.0 cr unu---uuuuu 180411e20131201xx s 000 0 eng 10.1134/S1075701513080096 doi (NATIONALLICENCE)springer-10.1134/S1075701513080096 Mariinskite, BeCr2O4, a new mineral, chromium analog of chrysoberyl [Elektronische Daten] [L. Pautov, M. Popov, Yu. Erokhin, V. Khiller, V. Karpenko] A new mineral, mariinskite, BeCr2O4, the chromium analog of chrysoberyl, has been found at the Mariinsky (Malyshevo) deposit, the Ural Emerald Mines, the Central Urals, Russia. The mineral is named after its type locality. It was discovered in chromitite in association with fluorphlogopite, Cr-bearing muscovite, eskolaite, and tourmaline. Mariinskite occurs as anhedral grains ranging from 0.01 to 0.3 mm in size; in some cases it forms pseudohexagonal chrysoberyl-type twins. The mineral is dark-green, with a pale green streak; the Mohs' hardness is 8.5, microhardness VHN = 1725 kg/mm2. D meas = 4.25(2) g/cm3, D calc = 4.25 g/cm3. Microscopically, it is emerald-green, pleochroic from emerald-green (γ) to yellow-green (β) and greenish yellow (α). The new mineral is biaxial (+), γ = 2.15(1), β = 2.09(3), and α = 2.05(1), 2V meas = 80 ± (10)°, 2V calc = 80.5°. In reflected light, it is gray with green reflections; R max (589) = 12.9%; R min (589) = 12.3%, and there are strong, internal green reflections. The strongest absorption bands in the IR spectrum are as follows (cm−1): 935, 700, 614, 534. Space group Pnma, a = 9.727(3), b = 5.619(1), c = 4.499(1) Å, V = 245.9(3) Å3, Z = 4. The strongest reflections in the X-ray powder diffraction pattern are as follows (d Å, I, hkl): 4.08(40)(101), 3.31(90)(111), 2.629(50)(301), 2.434(50)(220), 2.381(40)(311), 2.139(60)(221), 1.651(100)(222). The average chemical composition of mariinskite (electron microprobe, wt %) is as follows: BeO 16.3, Al2O3 23.89, Cr2O3 58.67, Fe2O3 0.26, V2O3 0.26, TiO2 0.61, total is 99.98. The empirical formula, calculated on the basis of four O atoms is Be1.03(Cr1.22Al0.74Ti0.01Fe0.01V0.01)1.99O4. The compatibility index 1 − (Kp/Kc), 0.019, is excellent. The type specimens are deposited in the Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, and the Ural Geological Museum, Yekaterinburg, Russia. Pleiades Publishing, Ltd., 2013 Pautov L. Fersman Mineralogical Museum, Russian Academy of Sciences, Leninsky pr. 18-2, 119071, Moscow, Russia aut Popov M. Institute of Geology and Geochemistry, Ural Division, Russian Academy of Sciences, Pochtovyi per. 7, 620151, Yekaterinburg, Russia aut Erokhin Yu Institute of Geology and Geochemistry, Ural Division, Russian Academy of Sciences, Pochtovyi per. 7, 620151, Yekaterinburg, Russia aut Khiller V. Institute of Geology and Geochemistry, Ural Division, Russian Academy of Sciences, Pochtovyi per. 7, 620151, Yekaterinburg, Russia aut Karpenko V. Fersman Mineralogical Museum, Russian Academy of Sciences, Leninsky pr. 18-2, 119071, Moscow, Russia aut Geology of Ore Deposits Springer US; http://www.springer-ny.com 55/8(2013-12-01), 648-662 1075-7015 55:8<648 2013 55 11477 https://doi.org/10.1134/S1075701513080096 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S1075701513080096 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Pautov L. Fersman Mineralogical Museum, Russian Academy of Sciences, Leninsky pr. 18-2, 119071, Moscow, Russia aut NATIONALLICENCE 700 1- Popov M. Institute of Geology and Geochemistry, Ural Division, Russian Academy of Sciences, Pochtovyi per. 7, 620151, Yekaterinburg, Russia aut NATIONALLICENCE 700 1- Erokhin Yu Institute of Geology and Geochemistry, Ural Division, Russian Academy of Sciences, Pochtovyi per. 7, 620151, Yekaterinburg, Russia aut NATIONALLICENCE 700 1- Khiller V. Institute of Geology and Geochemistry, Ural Division, Russian Academy of Sciences, Pochtovyi per. 7, 620151, Yekaterinburg, Russia aut NATIONALLICENCE 700 1- Karpenko V. Fersman Mineralogical Museum, Russian Academy of Sciences, Leninsky pr. 18-2, 119071, Moscow, Russia aut NATIONALLICENCE 773 0- Geology of Ore Deposits Springer US; http://www.springer-ny.com 55/8(2013-12-01), 648-662 1075-7015 55:8<648 2013 55 11477 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer