Well-crystallized euhedral crystals of aluminian lizardite-2H(2) (Mg2.35Fe0.062+Fe0.073+Al0.52) (Si1.41Al0.59)O-5.00(OH)(4.00) were found near Schio (Vicenza, Italy). To gain insight into the role of a high Al content lizardite, chemical analyses and single-crystal X-ray data collection were conducted. Structure refinement, completed in space group P6(3) (agreement factor R = 0.034), gives mean T-O values of 1.654 Angstrom and 1.664 Angstrom for T1 and T2 sites, respectively. The ditrigonal distortion of the six-membered tetrahedral ring is positive (alpha = +9.7 degrees), as expected for the 2H(2) polytype. The octahedral site has a mean bond length similar to that of the Mg-rich octahedra of amesite and distortion parameters similar to those of Al-rich octahedra.

Crystal structure refinement of aluminian lizardite-2H(2) / Brigatti, Maria Franca; Galli, Ermanno; Medici, L; Poppi, Luciano. - In: AMERICAN MINERALOGIST. - ISSN 0003-004X. - STAMPA. - 82:(1997), pp. 931-935.

Crystal structure refinement of aluminian lizardite-2H(2)

BRIGATTI, Maria Franca;GALLI, Ermanno;POPPI, Luciano
1997

Abstract

Well-crystallized euhedral crystals of aluminian lizardite-2H(2) (Mg2.35Fe0.062+Fe0.073+Al0.52) (Si1.41Al0.59)O-5.00(OH)(4.00) were found near Schio (Vicenza, Italy). To gain insight into the role of a high Al content lizardite, chemical analyses and single-crystal X-ray data collection were conducted. Structure refinement, completed in space group P6(3) (agreement factor R = 0.034), gives mean T-O values of 1.654 Angstrom and 1.664 Angstrom for T1 and T2 sites, respectively. The ditrigonal distortion of the six-membered tetrahedral ring is positive (alpha = +9.7 degrees), as expected for the 2H(2) polytype. The octahedral site has a mean bond length similar to that of the Mg-rich octahedra of amesite and distortion parameters similar to those of Al-rich octahedra.
1997
82
931
935
Crystal structure refinement of aluminian lizardite-2H(2) / Brigatti, Maria Franca; Galli, Ermanno; Medici, L; Poppi, Luciano. - In: AMERICAN MINERALOGIST. - ISSN 0003-004X. - STAMPA. - 82:(1997), pp. 931-935.
Brigatti, Maria Franca; Galli, Ermanno; Medici, L; Poppi, Luciano
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/8843
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