The crystal chemistry of alkali amphiboles from the Kajlidongri manganese mine, India. (Articolo in rivista)

Type
Label
  • The crystal chemistry of alkali amphiboles from the Kajlidongri manganese mine, India. (Articolo in rivista) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Alternative label
  • Hawthorne F.C.; Oberti R.; Zanetti A.; Nayak V.K. (2008)
    The crystal chemistry of alkali amphiboles from the Kajlidongri manganese mine, India.
    in Canadian mineralogist
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Hawthorne F.C.; Oberti R.; Zanetti A.; Nayak V.K. (literal)
Pagina inizio
  • 455 (literal)
Pagina fine
  • 466 (literal)
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  • 46 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Frank C. HAWTHORNE, Roberta OBERTI and Alberto ZANETTI CNR Istituto di Geoscienze e Georisorse, Università di Pavia, via Ferrata 1, I-27100 Pavia, Italy V.K. NAYAK Department of Applied Geology, Indian School of Mines, Dhanbad 826-004, India (literal)
Titolo
  • The crystal chemistry of alkali amphiboles from the Kajlidongri manganese mine, India. (literal)
Abstract
  • The crystal structures of eight sodic-calcic and sodic amphiboles from the Kajlidongri manganese mine, India, have been refined to R values of 1-2% using single-crystal MoKa X-ray data. The crystals used in the collection of the intensity data were subsequently analyzed by electron- and ion-microprobe techniques. Site populations were assigned from the results of site-scattering refinement and stereochemical analysis, taking into account the unit formula determined for each crystal. These amphiboles range in composition from richterite to magnesioriebeckite to magnesio-arfvedsonite. All amphiboles contain Li, which ranges from 0.03 to 0.30 apfu and is completely ordered at the M(3) site. The amount of F in each crystal is equal to twice the amount of Li, suggesting that Li, which is ordered at the M(3) site, is locally associated with F at both the adjacent O(3) sites. The patterns of electron density in the A cavity and the populations at the A, O(3) and M(4) sites are in accord with previously proposed patterns of short-range order in monoclinic amphiboles. The compositions of these amphiboles lie along the join richterite-magnesioriebeckite and show a surprising degree of coherence in their major-element compositions considering the heterogeneity of the host rocks. (literal)
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