A structural study of the lithiophilite-sicklerite series (Articolo in rivista)

Type
Label
  • A structural study of the lithiophilite-sicklerite series (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.3749/canmin.50.4.843 (literal)
Alternative label
  • Hatert F. 1); Ottolini L. 2); Wouters J. 3); Fontan F. 4); (2012)
    A structural study of the lithiophilite-sicklerite series
    in Canadian mineralogist
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Hatert F. 1); Ottolini L. 2); Wouters J. 3); Fontan F. 4); (literal)
Pagina inizio
  • 843 (literal)
Pagina fine
  • 854 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#altreInformazioni
  • Nel Volume Speciale: \"GRANITIC PEGMATITES AND THEIR MINERALS: A TRIBUTE TO PETR CERNY\" (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 50 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 4 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1) Laboratoire de Minéralogie, B18, Université de Liège, B-4000 Liège, Belgium; 2) C.N.R.-Istituto di Geoscienze e Georisorse (IGG), Unità di Pavia, Via A. Ferrata 1, I-27100 Pavia, Italy; 3) Laboratoire de Chimie Biologique Structurale, Département de Chimie, Facultés Universitaires Notre-Dame de la Paix (FUNDP), Rue de Bruxelles 61, B-5000 Namur, Belgium; 4) LMTG-UMR 5563, Observatoire Midi Pyrénées, 14 Avenue E. Belin, F-31400 Toulouse, France; (literal)
Titolo
  • A structural study of the lithiophilite-sicklerite series (literal)
Abstract
  • A sample from the Koktokay No. 3 granitic pegmatite, Altai Mountains, northwestern China, which shows a transition from lithiophilite [LiMn2+PO4] to sicklerite [Li1-xMn2+PO4], was investigated by single-crystal X-ray diffraction, electron-microprobe analysis, and secondary-ion mass spectrometry (SIMS) techniques. Under the polarizing microscope, the sample shows colorless lithiophilite and deep-orange sicklerite, as well as several intermediate phases. The chemical compositions change from Li0.96(Mn2+0.81Fe2+0.09Fe3+0.08)PO4 to Li0.69(Mn2+0.62Mn3+0.19Fe3+0.16)PO4, and show a progressive decrease of the lithium content from lithiophilite to sicklerite. Five crystals were extracted from the thin section, and their crystal structures were refined in space group Pbnm, with unit-cell parameters from a 4.736(1), b 10.432(2), c 6.088(1) Å (lithiophilite), to a 4.765(1), b 10.338(1), c 6.060(1) Å (sicklerite). The olivine-type structures of these phosphates are identical to that of triphylite, and are characterized by two chains of edge-sharing octahedra parallel to the c axis. The first chain consists of M1 octahedra containing Li atoms and vacancies, and the second chain consists of M2 octahedra occupied by Fe and Mn. The significant Mn3+ content in sicklerite necessitates a more careful interpretation of the electron-microprobe data, and demonstrates the different mechanisms of oxidation affecting the lithiophilite-sicklerite and triphylite-ferrisicklerite series, respectively. (literal)
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