Refinement of the crystal structure of Zn-containing greifensteinite |
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| Authors: | A V Barinova R K Rastsvetaeva N V Chukanov A Pietraszko |
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| Institution: | (1) Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, Moscow, 119333, Russia;(2) Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia;(3) Trzebiatowski Institute for Low Temperature and Structure Research, Polish Academy of Sciences, PO Box 1410, 50-950 2 Wroclaw, Poland |
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| Abstract: | The crystal structure of Zn-containing greifensteinite from the Pirineus Mine (Minas Gerais, Brazil) was refined (R = 0.045, 562 reflections with |F| > 2σ(F)). The unit-cell parameters are a = 15.941(3) Å, b = 11.877(3) Å, c = 6.625(2) Å, β = 95.09(2)°; V = 1249.4 Å3; sp. gr. C2/c; and Z = 2. The idealized formula is Mn(Fe2+, Zn)4]Ca2Be4(PO4)6(OH)4 · 6H2O. The mineral is isostructural with the previously studied monoclinic representatives of the roscherite group from different deposits and differs from these representatives in that it contains Zn in one of two octahedral positions. |
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