Synthesis and characterisation of ferri-clinoferroholmquistite, Li2 (Fe2+3Fe3+2) Si8 O22(OH)2 (Articolo in rivista)

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  • Synthesis and characterisation of ferri-clinoferroholmquistite, Li2 (Fe2+3Fe3+2) Si8 O22(OH)2 (Articolo in rivista) (literal)
Anno
  • 2003-01-01T00:00:00+01:00 (literal)
Alternative label
  • IEZZI G.; DELLA VENTURA G.; PEDRAZZI G.; ROBERT J.-L.; OBERTI R. (2003)
    Synthesis and characterisation of ferri-clinoferroholmquistite, Li2 (Fe2+3Fe3+2) Si8 O22(OH)2
    in European journal of mineralogy (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • IEZZI G.; DELLA VENTURA G.; PEDRAZZI G.; ROBERT J.-L.; OBERTI R. (literal)
Pagina inizio
  • 321 (literal)
Pagina fine
  • 328 (literal)
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  • 15 (literal)
Rivista
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  • 8 (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • I.S.T.O.-C.N.R.S., 1A, Rue de la Férollerie, F-45071 Orléans Cedex 2, France; Dipartimento di Scienze della Terra, Università della Calabria, Arcavacata di Rende, I-87036, Italy;Dipartimento di Sanità Pubblica, Sezione di Fisica, INFM Università di Parma, Via Volturno, 39, I-43100 Parma, Italy; CNR-Istituto di Geoscienze e Georisorse, sezione di Pavia, via Ferrata 1, I-27100 Pavia, Italy (literal)
Titolo
  • Synthesis and characterisation of ferri-clinoferroholmquistite, Li2 (Fe2+3Fe3+2) Si8 O22(OH)2 (literal)
Abstract
  • This work reports the synthesis and crystal-chemistry of ferri-clinoferroholmquistite in the system Li2O - FeO - Fe2O3- SiO2 - H2O. Ferri-clinoferroholmquistite has a very restricted temperature stability. An almost monophase amphibole product is obtained at 500°C for a wide pressure range (1-7 kbar), whereas a Li-bearing pyroxene becomes predominant for T ³ 600°C. The X-ray powder pattern of ferri-clinoferroholmquistite was indexed in the C2/m space group. Refined cell dimensions are: a =9.489 (2), b = 18.036 (7), c = 5.313 (3) Å; b = 101.59 (3)°. Infrared spectra in the OH-stretching region show the presence of a single and very sharp band at 3614 cm-1, which is assigned to the Fe2+Fe2+Fe2+ trimer at the OH-coordinated M1M1M3 octahedra, and a small satellite band at 3644 cm-1 which was assigned to Li at M3. Mössbauer spectra can be fitted to three doublets assigned to Fe3+ at M2, Fe2+ at M1 and Fe2+ at M3, respectively, with a calculated Fe3+/Fe2+ ratio of 2/3, suggesting a composition close to the nominal one. The spectroscopic data show that synthetic ferri-clinoferroholmquistite has a strongly ordered cation distribution, in agreement with single-crystal refinements done by Caballero et al. (1998) and Oberti et al. (2000) on natural samples with related Li-rich compositions. (literal)
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