The crystal structure of piergorite-(Ce), Ca8Ce2(A10.5Fe3+0.5)Sigma1( , Li, Be)2Si6B8036(OH,F)2:A new borosilicate from Vetralla, Italy, with a modified hellandite type chain. (Articolo in rivista)

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  • The crystal structure of piergorite-(Ce), Ca8Ce2(A10.5Fe3+0.5)Sigma1( , Li, Be)2Si6B8036(OH,F)2:A new borosilicate from Vetralla, Italy, with a modified hellandite type chain. (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.2138/am.2006.2139 (literal)
Alternative label
  • Boiocchi M.; Callegari A.; Ottolini L. (2006)
    The crystal structure of piergorite-(Ce), Ca8Ce2(A10.5Fe3+0.5)Sigma1( , Li, Be)2Si6B8036(OH,F)2:A new borosilicate from Vetralla, Italy, with a modified hellandite type chain.
    in The American mineralogist; Mineralogical Society of America, Washington (Italia)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Boiocchi M.; Callegari A.; Ottolini L. (literal)
Pagina inizio
  • 1170 (literal)
Pagina fine
  • 1177 (literal)
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  • 91 (literal)
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Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 7 (literal)
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  • ISI Web of Science (WOS) (literal)
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  • Boiocchi M. 1); Callegari A. 2); Ottolini L. 3). 1) Univ Pavia, Centro Grandi Strumenti, I-27100 Pavia, Italy 2) Univ Pavia, Dipartimento Sci Terra, I-27100 Pavia, Italy 3) CNR, IGG, Sede Pavia, I-27100 Pavia, Italy (literal)
Titolo
  • The crystal structure of piergorite-(Ce), Ca8Ce2(A10.5Fe3+0.5)Sigma1( , Li, Be)2Si6B8036(OH,F)2:A new borosilicate from Vetralla, Italy, with a modified hellandite type chain. (literal)
Abstract
  • Piergorite-(Ce) is a new mineral found at Tre Croci, Vetralla, Italy with simplified formula Ca8Ce2 (Al0.5Fe0.53+)(Sigma 1)(square,Li,Be)(2)Si6B8O36(OH,F)(2). It occurs as strong intergrowths of small crystals, colorless to pale yellow, associated with sanidine, mica, magnetite, rutile, titanite, and other Th-U-REE bearing minerals, in miarolitic cavities of a syenitic ejectum. Piergorite-(Ce) is biaxial negative, n(alpha) = 1.717 (1), n(beta) = 1.728 (1), and n(gamma) = 1.735 (1), 2V(meas) = 68(2)degrees, X = b, and Z (boolean AND) c = 7(1)degrees. Crystals show tabular habit and a very good {010} cleavage; twinning along the (30 (1) over bar) plane produces \"L\" forms. The three strongest lines in the simulated powder diffraction pattern (d(obs), I, hkl) are: 2.65 angstrom, 100.0, (213, (4) over bar 13); 1.91 angstrom, 48.3, (223, (4) over bar 23, 821); 2.90 angstrom, 44.9, ((6) over bar 03, (6) over bar 12). The structure was solved by Patterson synthesis from X-ray diffraction data [monoclinic, space group P2/a, a = 28.097(3) angstrom, b = 4.777(1) angstrom, c = 10.236(2) angstrom, beta = 96.81 (1)degrees, V = 1364.2(7) angstrom(3), Z = 2] and was refined to a final R-obs = 0.059 for 6480 Fo with I-o > 3 sigma(I-o). The structure shows similarities with the hellandite group because Si and B tetrahedra form chains along c. Hellandite structure is characterized by a single chain of five-membered rings, whereas piergorite-(Ce) shows a double chain of five-membered rings interconnected by a single octahedral site to form a three-dimensional framework containing five independent eightfold-coordinated M sites and a partly occupied T-cavity. (literal)
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