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- W2109564377 abstract "Abstract The mineral natrodufrenite a secondary pegmatite phosphate mineral from Minas Gerais, Brazil, has been studied by a combination of scanning electron microscopy and vibrational spectroscopic techniques. Electron probe analysis shows the formula of the studied mineral as (Na 0.88 Ca 0.12 ) ∑1.00 ( Fe 0.72 2 + Mn 0.11 Mg 0.08 Ca 0.04 Zr 0.01 Cu 0.01 ) ∑0.97 ( Fe 4.89 3 + Al 0.02 ) ∑4.91 (PO 4 ) 3.96 (OH 6.15 F 0.07 ) 6.22 ⋅2.05(H 2 O). Raman spectroscopy identifies an intense peak at 1003 cm −1 assigned to the PO 4 3 - ν 1 symmetric stretching mode. Raman bands are observed at 1059 and 1118 cm −1 and are attributed to the PO 4 3 - ν 3 antisymmetric stretching vibrations. A comparison is made with the spectral data of other hydrate hydroxy phosphate minerals including cyrilovite and wardite. Raman bands at 560, 582, 619 and 668 cm −1 are assigned to the ν 4 PO 4 3 - bending modes and Raman bands at 425, 444, 477 and 507 cm −1 are due to the ν 2 PO 4 3 - bending modes. Raman bands in the 2600–3800 cm −1 spectral range are attributed to water and OH stretching vibrations. Vibrational spectroscopy enables aspects of the molecular structure of natrodufrenite to be assessed." @default.
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- W2109564377 date "2013-11-01" @default.
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- W2109564377 title "Assessment of the molecular structure of natrodufrénite – <mml:math altimg=si1.gif overflow=scroll xmlns:xocs=http://www.elsevier.com/xml/xocs/dtd xmlns:xs=http://www.w3.org/2001/XMLSchema xmlns:xsi=http://www.w3.org/2001/XMLSchema-instance xmlns=http://www.elsevier.com/xml/ja/dtd xmlns:ja=http://www.elsevier.com/xml/ja/dtd xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:tb=http://www.elsevier.com/xml/common/table/dtd xmlns:sb=http://www.elsevier.com/xml/common/struct-bib/…" @default.
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- W2109564377 doi "https://doi.org/10.1016/j.molstruc.2013.08.018" @default.
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