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Mineralogical ClassificationIMA 2013-097 = okruschite
22nd Aug 2014 11:44 UTCMarco E. Ciriotti Manager
▪ Chukanov, N.V., Möhn, G., Pekov, I.V., Belakovskiy, D.I., Bychkova, Y.V., Gurzhiy, V.V., Lorenz, J.A. (2014): Okruschite, Ca2Mn2+5Be4(AsO4)6(OH)4∙6H2O, a new roscherite-group mineral from Sailauf, Bavaria, Germany. European Journal of Mineralogy, 26,
589-595.
Abstract:
The new mineral okruschite (IMA No. 2013–097), the arsenate analogue of roscherite, was discovered in a hydrothermal vein cross-cutting rhyolite exposed in the Fuchs quarry, near Sailauf, Spessart Mountains, Bavaria, Germany. Associated minerals are braunite, Mn-bearing calcite and arseniosiderite. Okruschite forms tabular aggregates up to 0.15 × 0.3 × 0.3 mm in size of curved and somewhat misaligned laths. It is white, semitransparent; lustre is vitreous. Dmeas = 3.33(2), Dcalc = 3.340 g/cm3. Okruschite is optically biaxial (–), α = 1.671(3), β = 1.682(2), γ = 1.687(3), 2Vmeas = 65(5)°. The infrared spectrum is given. The chemical composition is (electron microprobe, B and Li by ICP MS, H2O by gas chromatography of ignition products, wt. %): Li2O 0.04, BeO 7.70, MgO 1.68, CaO 8.28, MnO 16.27, FeO 4.89, Al2O3 0.22, As2O5 51.11, H2O 11.0, total 101.19. The empirical formula based on 34 O atoms is: Ca1.99(Mn3.09Fe0.92Mg0.56Al0.06Li0.04)Σ4.67Be4.15(AsO4)5.99(OH)3.64·6.40H2O. The simplified formula is Ca2Mn2+5Be4(AsO4)6(OH)4·6H2O. Okruschite is monoclinic, C2/c, a = 16.33(4), b = 12.03(3), c = 6.93(1) Å, β = 94.84(5)°, V = 1357(4) Å3, Z = 2. The strongest lines of the powder X-ray diffraction pattern are: 9.68 (39) (110), 4.95 (34) (310), 4.17 (34) (–311), 3.25 (100) (–202, 330), 3.11 (32) (–421), 2.841 (27) (240), 2.711 (26) (600), 1.726 (26) (461, 552, 004). Okruschite is named after Professor Martin Okrusch, from Germany. Type material is deposited in the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow.
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Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2024, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: April 18, 2024 04:13:55