Crystal-structure refinement of a highly ordered staurolite (Articolo in rivista)

Type
Label
  • Crystal-structure refinement of a highly ordered staurolite (Articolo in rivista) (literal)
Anno
  • 1996-01-01T00:00:00+01:00 (literal)
Alternative label
  • Oberti R. 1; Hawthorne F.C. 1; Zanetti A. 1; Ottolini L. 1; Soto J.I. 2 (1996)
    Crystal-structure refinement of a highly ordered staurolite
    in Canadian mineralogist
    (literal)
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  • Oberti R. 1; Hawthorne F.C. 1; Zanetti A. 1; Ottolini L. 1; Soto J.I. 2 (literal)
Pagina inizio
  • 1051 (literal)
Pagina fine
  • 1057 (literal)
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  • 34 (literal)
Rivista
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  • 5 (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • 1. CNR,CTR STUDIO CRISTALLOCHIM & CRISTALLOG,VIA ABBIATEGRASSO 209,I-27100 PAVIA,ITALY. 2. UNIV GRANADA,CSIC,DEPT GEODINAM,E-18071 GRANADA,SPAIN (literal)
Titolo
  • Crystal-structure refinement of a highly ordered staurolite (literal)
Abstract
  • The crystal structure of zinc-rich staurolite, Zn2.40Fe1.41Mg1.27Mn0.01Ni0.01Ti0.09Li0.01Cr0.02Al16.80Si7.99O45(OH)(3), a 7.877(3), b 16.609(5), c 5.665(1) Angstrom, beta 90.68(2)degrees, V 741.0 Angstrom(3), Z = 1, from the Nevado-Filabride complex, Lubrin, Almeria province, Spain, has been refined to an R index of 2.0% based on 986 observed reflections collected with MoK alpha X-radiation. This crystal is poor in Al, as reflected in the high Si content and the large amount of [6]-coordinated Mg. The beta value is the largest yet measured for staurolite, and is slightly larger than the maximum beta-angle predicted for staurolite (Hawthorne et al. 1993b). Site-scattering refinement shows that the M(3) cations are highly, but not completely, ordered: Q(M(3)) [= (X(M(3A)) - X(M(3B)))/X(M(3A)) + X(M(3B)))] is equal to 0.89, rather than to the value of 1.0 expected for the beta angle of this crystal. However, the refined M(3A) and M(3B) site-scattering values are compatible with complete order of Al at M(3A) but disorder of Mg over M(3A) and M(3B). The results of this work quantitatively support the order-disorder model for staurolite proposed by Hawthorne et al. (1993b), but suggest that the quantitative details can be affected by the presence of [6]-coordinated Mg because it behaves differently from [6]-coordinated Al. (literal)
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