Crystal structure and chemistry of trilithionite-2M(2) and polylithionite-2M(2) (Articolo in rivista)

Type
Label
  • Crystal structure and chemistry of trilithionite-2M(2) and polylithionite-2M(2) (Articolo in rivista) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1127/0935-1221/2005/0017-0475 (literal)
Alternative label
  • Brigatti MF; Caprilli E; Malferrari D; Medici L; Poppi L (2005)
    Crystal structure and chemistry of trilithionite-2M(2) and polylithionite-2M(2)
    in European journal of mineralogy (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Brigatti MF; Caprilli E; Malferrari D; Medici L; Poppi L (literal)
Pagina inizio
  • 475 (literal)
Pagina fine
  • 481 (literal)
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  • 17 (literal)
Rivista
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  • 7 (literal)
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  • 3 (literal)
Note
  • Scopu (literal)
  • ISI Web of Science (WOS) (literal)
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  • (1) Dipartimento di Scienze della Terra dell'Università di Modena e Reggio Emilia, Via S. Eufemia 19, I-41100 Modena, Italy (2) CNR - Istituto di Metodologie per l'Analisi Ambientale, C.da S. Loja, I-85050 - Tito Scalo (PZ), Italy (literal)
Titolo
  • Crystal structure and chemistry of trilithionite-2M(2) and polylithionite-2M(2) (literal)
Abstract
  • The crystal chemistry of three Li-bearing mica-2M(2) crystals from pegmatites has been studied by chemical analyses and single crystal X-ray diffraction; their belonging to the trilithionite-polylithionite join is highlighted by the following compositional ranges in atoms per formula unit [based on O12-(x+y) (OH)(x)F-y] : 3.198 <= Si <= 3.538, 0.462 <= [IV]Al <= 0.811, 1.195 <= [IV]Al <= 1.390, 0.031 <= (Fe+Mn) <= 0.072, 1.522 <= Li <= 1.757, 0.872 <= K <= 0.906, 0.030 <= Na <= 0.073, 0.000 <= (Cs+Rb) <= 0.099, 1.541 F <= 1.722. The correlation between F and Li content is confirmed, as observed in Li-rich micas. Crystal structure refinements were carried out in space group C2/c (R values vary between 0.030 and 0.03 1). The crystal chemistry is mostly influenced by tetrahedral chemical composition. Increasing [IV]Al content, cc and psi(MI) parameters increase; Si content involves a lowering of the interlayer separation and tetrahedral thickness. Li content affects octahedral thickness. The stability of 2M(2) polytype seems to be induced by a relative increase of Delta z tetrahedral parameter, which reduces the repulsion between basal tetrahedral oxygen atoms. Unlike Li-bearing muscovite, trioctabedral Li-bearing mica crystals show an octahedral occupancy not related to octahedral charge. (literal)
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