THE CRYSTAL STRUCTURE OF ROSCOELITE-1M
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dc.contributor.author | Brigatti M.F. | |
dc.contributor.author | Caprilli E. | |
dc.contributor.author | Poppi L. | |
dc.contributor.author | Marchesini M. | |
dc.date.accessioned | 2021-11-26T07:42:37Z | |
dc.date.available | 2021-11-26T07:42:37Z | |
dc.date.issued | 2003 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=13871368 | |
dc.identifier.citation | Clays and Clay Minerals, 2003, 51, 3, 301-308 | |
dc.identifier.issn | 0009-8604 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/32469 | |
dc.description.abstract | 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. | |
dc.subject | Roscoelite | |
dc.title | THE CRYSTAL STRUCTURE OF ROSCOELITE-1M | |
dc.type | Статья |
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