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

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Autor(es): dc.creatorChukanov, Nikita V.-
Autor(es): dc.creatorCipriano, Ricardo Augusto Scholz-
Autor(es): dc.creatorAksenov, Sergey M.-
Autor(es): dc.creatorRastsvetaeva, Ramiza K.-
Autor(es): dc.creatorPekov, Igor V.-
Autor(es): dc.creatorBelakovskiy, Dmitriy I.-
Autor(es): dc.creatorKrambrock, Klaus Wilhelm Heinrich-
Autor(es): dc.creatorPaniago, Roberto Magalhães-
Autor(es): dc.creatorRighi, Ariete-
Autor(es): dc.creatorMartins, R. F.-
Autor(es): dc.creatorBelotti, Ricardo Augusto-
Autor(es): dc.creatorBermanec, Vladimir-
Data de aceite: dc.date.accessioned2025-08-21T15:08:55Z-
Data de disponibilização: dc.date.available2025-08-21T15:08:55Z-
Data de envio: dc.date.issued2017-07-28-
Data de envio: dc.date.issued2017-07-28-
Data de envio: dc.date.issued2012-
Fonte completa do material: dc.identifierhttp://www.repositorio.ufop.br/handle/123456789/8357-
Fonte completa do material: dc.identifierhttps://www.degruyter.com/view/j/minmag.2012.76.issue-3/minmag.2012.076.3.20/minmag.2012.076.3.20.xml-
Fonte completa do material: dc.identifierhttps://doi.org/10.1180/minmag.2012.076.3.20-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1003527-
Descrição: dc.descriptionThe 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.-
Formato: dc.formatapplication/pdf-
Idioma: dc.languageen-
Direitos: dc.rightsrestrito-
Palavras-chave: dc.subjectMetavivianite-
Palavras-chave: dc.subjectFormula revision-
Palavras-chave: dc.subjectMinas Gerais-
Palavras-chave: dc.subjectCrystal chemistry-
Título: dc.titleMetavivianite, Fe2+Fe3+2(PO4)2(OH)2 6H2O : new data and formula revision.-
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