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Metavivianite, Fe2+Fe3+2(PO4)2(OH)2·6H2O: new data and formula revision

Published online by Cambridge University Press:  05 July 2018

N. V. Chukanov*
Affiliation:
Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region 142432, Russia
R. Scholz
Affiliation:
Federal University of Ouro Preto (UFOP), Mining School, Geology Department, Ouro Preto, Minas Gerais, Brazil
S. M. Aksenov
Affiliation:
Institute of Crystallography, Russian Academy of Sciences, Leninsky Prospekt 59, Moscow 117333, Russia
R. K. Rastsvetaeva
Affiliation:
Institute of Crystallography, Russian Academy of Sciences, Leninsky Prospekt 59, Moscow 117333, Russia
I. V. Pekov
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, Moscow 119991 Russia
D. I. Belakovskiy
Affiliation:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Leninsky Prospekt 18-2, Moscow 119071, Russia
K. Krambrock
Affiliation:
Federal University of Minas Gerais (UFMG), ICEx, Physics Department, Belo Horizonte, Minas Gerais, Brazil
R. M. Paniago
Affiliation:
Federal University of Minas Gerais (UFMG), ICEx, Physics Department, Belo Horizonte, Minas Gerais, Brazil
A. Righi
Affiliation:
Federal University of Minas Gerais (UFMG), ICEx, Physics Department, Belo Horizonte, Minas Gerais, Brazil
R. F. Martins
Affiliation:
Federal University of Minas Gerais (UFMG), ICEx, Physics Department, Belo Horizonte, Minas Gerais, Brazil
F. M. Belotti
Affiliation:
Federal University of Itajubá (UNIFEI), Campus Itabira, Itabira, Minas Gerais, Brazil
V. Bermanec
Affiliation:
Geological Department, Faculty of Sciences and Mathematics, University of Zagreb, Zagreb, Croatia

Abstract

The composition, structure, X-ray powder diffraction pattern, optical properties, density, infrared, Raman and Mössbauer spectra, and thermal properties of a homogeneous sample of metavivianite from the Boa Vista pegmatite, near Galiléia, Minas Gerais, Brazil are reported for the first time. Metavivianite is biaxial (+) with α = 1.600(3), β = 1.640(3), γ = 1.685(3) and 2Vmeas = 85(5)°. The measured and calculated densities are Dmeas = 2.56(2) and Dcalc = 2.579 g cm–3. The chemical composition, based on electronmicroprobe analyses, Mössbauer 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)Σ3.015(PO4)1.98(OH)1.72·6.36H2O. Metavivianite is triclinic, P, a = 7.989(1), b = 9.321(2), c = 4.629(1) Å, α = 97.34(1), β = 95.96(1), γ = 108.59(2)°, V = 320.18(11) Å3 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.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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