Metavivianite, Fe2+Fe3+2(PO4)2(OH)2 6H2O : new data and formula revision.
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Data
2012
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Resumo
The composition, structure, X-ray powder diffraction pattern, optical properties, density, infrared, Raman
and Mo¨ssbauer spectra, and thermal properties of a homogeneous sample of metavivianite from the Boa
Vista pegmatite, near Galile´ia, Minas Gerais, Brazil are reported for the first time. Metavivianite is biaxial
(+) with a = 1.600(3), b = 1.640(3), g = 1.685(3) and 2Vmeas = 85(5)º. The measured and calculated
densities are Dmeas = 2.56(2) and Dcalc = 2.579 g cm 3. The chemical composition, based on electronmicroprobe
analyses, Mo¨ssbauer spectroscopy (to determine the Fe2+:Fe3+ ratio) and gas chromatography
(to determine H2O) is MgO 0.70, MnO 0.92, FeO 17.98, Fe2O3 26.60, P2O5 28.62, H2O 26.5; total
101.32 wt.%. The empirical formula is (Fe3+
1.64Fe2+
1.23Mg0.085Mn0.06)S3.015(PO4)1.98(OH)1.72·6.36H2O.
Metavivianite is triclinic, P1¯ , a = 7.989(1), b = 9.321(2), c = 4.629(1) A ˚ , a = 97.34(1), b = 95.96(1),
g = 108.59(2)º, V = 320.18(11) A ˚ 3 and Z = 1. The crystal structure was solved using a single-crystal
techniques to an agreement index R = 6.0%. The dominant cations in the independent sites are Fe2+ and
Fe3+, with multiplicities of 1 and 2, respectively. The simplified crystal-chemical formula for
metavivianite is Fe2+(Fe3+,Fe2+)2(PO4)2(OH,H2O)2·6H2O; the endmember formula is
Fe2+Fe3+
2 (PO4)2(OH)2·6H2O, which is dimorphous with ferrostrunzite.
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Metavivianite, Formula revision, Minas Gerais, Crystal chemistry
Citação
CHUKANOV, N. V. et al. Metavivianite, Fe2+Fe3+2(PO4)2(OH)2 6H2O: new data and formula revision. Mineralogical Magazine, v. 76, p. 725-741, 2012. Disponível em: <https://www.degruyter.com/view/j/minmag.2012.76.issue-3/minmag.2012.076.3.20/minmag.2012.076.3.20.xml>. Acesso em: 20 de jun. 2017.