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The Crystal Structure of Roscoelite-1M

Published online by Cambridge University Press:  01 January 2024

Maria Franca Brigatti*
Affiliation:
Department of Earth Sciences, University of Modena and Reggio Emilia, Italy
Enrico Caprilli
Affiliation:
Department of Earth Sciences, University of Modena and Reggio Emilia, Italy
Marco Marchesini
Affiliation:
ENI-AGIP Towers, San Donato Milanese, Milano, Italy
Luciano Poppi
Affiliation:
Department of Earth Sciences, University of Modena and Reggio Emilia, Italy
*
*E-mail address of corresponding author: brigatti@unimo.it
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Abstract

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Single-crystal X-ray diffraction experiments were carried out on roscoelite crystals from Reppia, Val Graveglia, Italy. Roscoelite [structural formula: XII(Ba0.006K0.994)IV(Si3.150Al0.850) VI(Al0.040Fe0.150Mg0.100Mn0.062V1.696Ti0.003)O10(OH)2] shows a near-perfect three-dimensional stacking order with cell parameters a = 5.292(1), b = 9.131(2), c = 10.206(3) Å, β = 100.98(2)° and space group C2/m, which indicate a 1M polytype. The crystal structure was refined on the basis of Fo2 for 846 unique reflections to R1 = 3.29% calculated using 746 unique observed reflections [|Fo| ⩾ 4σ(Fo)]. The mean tetrahedral cation–oxygen atom distance, <T−O> = 1.641 Å, is close to the mean <T−O> value obtained for dioctahedral true micas from the literature, whereas the octahedral sheet is characterized by a larger cis-octahedral cation–oxygen atom bond distance <M2−O> = 2.020 Å which, together with the mean electron count, is consistent with V occupancy. The presence of V within the octahedral sheet produces the smallest tetrahedral rotation (α = 2.3°), the lowest flattening of the basal oxygen surface (Δz = 0.118 Å) and the narrowest interlayer separation (3.030 Å) in dioctahedral micas.

Type
Research Article
Copyright
Copyright © 2003, The Clay Minerals Society

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