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

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dc.contributor.authorChukanov, Nikita V.
dc.contributor.authorCipriano, Ricardo Augusto Scholz
dc.contributor.authorAksenov, Sergey M.
dc.contributor.authorRastsvetaeva, Ramiza K.
dc.contributor.authorPekov, Igor V.
dc.contributor.authorBelakovskiy, Dmitriy I.
dc.contributor.authorKrambrock, Klaus Wilhelm Heinrich
dc.contributor.authorPaniago, Roberto Magalhães
dc.contributor.authorRighi, Ariete
dc.contributor.authorMartins, R. F.
dc.contributor.authorBelotti, Ricardo Augusto
dc.contributor.authorBermanec, Vladimir
dc.date.accessioned2017-07-28T13:09:16Z
dc.date.available2017-07-28T13:09:16Z
dc.date.issued2012
dc.description.abstractThe 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.pt_BR
dc.identifier.citationCHUKANOV, 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.pt_BR
dc.identifier.doihttps://doi.org/10.1180/minmag.2012.076.3.20
dc.identifier.issn1471-8022
dc.identifier.urihttp://www.repositorio.ufop.br/handle/123456789/8357
dc.identifier.uri2https://www.degruyter.com/view/j/minmag.2012.76.issue-3/minmag.2012.076.3.20/minmag.2012.076.3.20.xmlpt_BR
dc.language.isoen_USpt_BR
dc.rightsrestritopt_BR
dc.subjectMetavivianitept_BR
dc.subjectFormula revisionpt_BR
dc.subjectMinas Geraispt_BR
dc.subjectCrystal chemistrypt_BR
dc.titleMetavivianite, Fe2+Fe3+2(PO4)2(OH)2 6H2O : new data and formula revision.pt_BR
dc.typeArtigo publicado em periodicopt_BR
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