ON THE CRYSTALCHEMISTRY OF A NEARENDMEMBER TRIPLITE, Mn2+2(PO4)F, FROM THE CODERA VALLEY (SONDRIO PROVINCE, CENTRAL ALPS, ITALY) (Articolo in rivista)

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  • ON THE CRYSTALCHEMISTRY OF A NEARENDMEMBER TRIPLITE, Mn2+2(PO4)F, FROM THE CODERA VALLEY (SONDRIO PROVINCE, CENTRAL ALPS, ITALY) (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.3749/canmin.52.2.235 ? (literal)
Alternative label
  • Pietro Vignola; Diego Gatta; Frédéric Hatert; Alessandro Guastoni; Danilo Bersani (2014)
    ON THE CRYSTALCHEMISTRY OF A NEARENDMEMBER TRIPLITE, Mn2+2(PO4)F, FROM THE CODERA VALLEY (SONDRIO PROVINCE, CENTRAL ALPS, ITALY)
    in Canadian mineralogist
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Pietro Vignola; Diego Gatta; Frédéric Hatert; Alessandro Guastoni; Danilo Bersani (literal)
Pagina inizio
  • 235 (literal)
Pagina fine
  • 245 (literal)
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  • 52 (literal)
Rivista
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  • 11 (literal)
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  • 2 (literal)
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  • CNR, Istituto per la dinamica dei processi ambientali, via Mario Bianco 9, 20131 Milano, Italy and Dipartimento di Scienze della Terra, Università degli Studi di Milano, via Botticelli 23, 20133 Milano, Italy Dipartimento di Scienze della Terra, Università degli Studi di Milano, via Botticelli 23, 20133 Milano, Italy Laboratoire de Minéralogie, Département de Géologie, Université de Liège, Bâtiment B18, Sart Tilman, B4000 Liège, Belgium Dipartimento di Mineralogia e Petrologia, Università di Padova, Corso Garibaldi 3735137 Padova, Italy Dipartimento di Fisica, Università di Parma, Viale G.P. Usberti 7/a, 43124 Parma, Italy (literal)
Titolo
  • ON THE CRYSTALCHEMISTRY OF A NEARENDMEMBER TRIPLITE, Mn2+2(PO4)F, FROM THE CODERA VALLEY (SONDRIO PROVINCE, CENTRAL ALPS, ITALY) (literal)
Abstract
  • ItalyAbstractThe crystal-chemistry of a near-endmember triplite, a manganese fluoro-phosphate [ideal chemical formula Mn2(PO4)F; a 12.109(2) Å, b 6.5162(8) Å, c 10.117(1) Å, and b 106.16(2)°; space group I 2/a], from a granitic pegmatite exposed in the Codera Valley (Sondrio Province, Central Alps), has been investigated by means of wavelength dispersive electron-microprobe, infrared and Raman spectroscopies, and X-ray powder and single-crystal diffraction. Single-crystal anisotropic structure refinement gave a final agreement index R1 = 0.0318 for 76 refined parameters and 1128 unique reflections with Fo > 4?(Fo). The structure refinement of triplite from the Codera Valley confirms the topological features previously described both for a natural sample from Mica Lode (Colorado) and for the synthetic compound Mn2(PO4)F. The structure consists of isolated PO4 tetrahedra joined with distorted MO4F2 octahedra. The M(1) and M(2) octahedra share their edges to form chains; the chains of M(1) octahedra are parallel to [010], and those of M(2) are parallel to [100]. The analysis of the difference-Fourier maps of the electron density of triplite from the Codera Valley reveals a unique position for F, as reported in the literature for the OH-free synthetic Mn2(PO4)F. In contrast, two mutually exclusive F sites, with partial site occupancy, were reported in a previous structural study of OH-bearing triplite from Colorado (Mica Lode). (literal)
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