This contribution deals about the crystal chemical characterization of fluorannite from Katugin Ta-Nb deposit, Chitinskaya Oblast’, Kalar Range, Transbaikalia, Eastern-Siberian Region, Russia. The mineral chemical formula is (K0.960Na0.020Ba0.001) (Fe2+2.102Fe3+0.425Cr3+0.002Mg0.039Li0.085Ti0.210Mn0.057) (Al0.674 Si3.326) O10 (F1.060OH0.028O0.912). This mica belongs to 1M polytype (space group C2/m) with layer parameters a = 5.3454(2) Å, b = 9.2607(4) Å, c = 10.2040(5) Å, beta = 100.169(3)°. Structure refinement, using anisotropic displacement parameters, converged at R = 0.0384. When compared to annite, fluorannite shows a smaller cell volume (Vfluorannite = 497.19 Å3; Vannite = 505.71 Å3), because of its smaller lateral dimensions and its reduced c parameter. The flattening of the tetrahedral basal oxygen atoms plane decreases with F content, together with the A-O4 distance (i.e., the distance between interlayer A cation and the octahedral anionic position) because of the reduced repulsion between the interlayer cation and the anion sited in O4.

Crystal structure and crystal chemistry of fluorannite and its relationships to annite / Brigatti, Maria Franca; Caprilli, Enrico; Malferrari, Daniele; Mottana, A.. - In: MINERALOGICAL MAGAZINE. - ISSN 0026-461X. - STAMPA. - 71:6(2007), pp. 683-690. [10.1180/minmag.2007.071.6.683]

Crystal structure and crystal chemistry of fluorannite and its relationships to annite

BRIGATTI, Maria Franca;CAPRILLI, Enrico;MALFERRARI, Daniele;
2007

Abstract

This contribution deals about the crystal chemical characterization of fluorannite from Katugin Ta-Nb deposit, Chitinskaya Oblast’, Kalar Range, Transbaikalia, Eastern-Siberian Region, Russia. The mineral chemical formula is (K0.960Na0.020Ba0.001) (Fe2+2.102Fe3+0.425Cr3+0.002Mg0.039Li0.085Ti0.210Mn0.057) (Al0.674 Si3.326) O10 (F1.060OH0.028O0.912). This mica belongs to 1M polytype (space group C2/m) with layer parameters a = 5.3454(2) Å, b = 9.2607(4) Å, c = 10.2040(5) Å, beta = 100.169(3)°. Structure refinement, using anisotropic displacement parameters, converged at R = 0.0384. When compared to annite, fluorannite shows a smaller cell volume (Vfluorannite = 497.19 Å3; Vannite = 505.71 Å3), because of its smaller lateral dimensions and its reduced c parameter. The flattening of the tetrahedral basal oxygen atoms plane decreases with F content, together with the A-O4 distance (i.e., the distance between interlayer A cation and the octahedral anionic position) because of the reduced repulsion between the interlayer cation and the anion sited in O4.
2007
71
6
683
690
Crystal structure and crystal chemistry of fluorannite and its relationships to annite / Brigatti, Maria Franca; Caprilli, Enrico; Malferrari, Daniele; Mottana, A.. - In: MINERALOGICAL MAGAZINE. - ISSN 0026-461X. - STAMPA. - 71:6(2007), pp. 683-690. [10.1180/minmag.2007.071.6.683]
Brigatti, Maria Franca; Caprilli, Enrico; Malferrari, Daniele; Mottana, A.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/612271
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