THE CRYSTAL STRUCTURE OF CHROMIAN KASSITE FROM THE SARANOVSKOYE DEPOSIT, NORTHERN URALS, RUSSIA
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dc.contributor.author | Grey I.E. | |
dc.contributor.author | Mumme W.G. | |
dc.contributor.author | Pekov I.V. | |
dc.contributor.author | Pushcharovsky D.Yu. | |
dc.date.accessioned | 2021-11-23T00:58:43Z | |
dc.date.available | 2021-11-23T00:58:43Z | |
dc.date.issued | 2003 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=13437232 | |
dc.identifier.citation | American Mineralogist, 2003, 88, 8-9, 1331-1335 | |
dc.identifier.issn | 0003-004X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/32381 | |
dc.description.abstract | The crystal structure of kassite, ideally Ca[Ti2O4(OH)2], containing 2 wt% Cr2O3, from the Saranovskoye chromite deposit, Perm' district, Northern Urals, has been determined and refined to R1 = 0.06 using single crystal X-ray diffraction data. The crystals have monoclinic symmetry, P21/a, with a = 5.275(1), b = 9.009 (2), c = 9.557 (2) Å, β = 90.43°. A pronounced sub-structure for the mineral, conforming to space group I2/a, is related to the I2/a structure for lucasite-(Ce), Ce[Ti2O5(OH)]. It comprises (001) layers of gibbsite-like fused hexagonal rings of edge-shared Ti(O,OH)6 octahedra with the Ca atoms sandwiched between pairs of opposing rings and displaced from the center of the rings along [010]. Ordering of the protons in chromian kassite lowers the symmetry to P21/a. Kassite, CaTi2O4(OH)2, and cafetite, CaTi2O5(H2O), are identical chemically but significantly different in their crystal structures. | |
dc.subject | Kassite | |
dc.title | THE CRYSTAL STRUCTURE OF CHROMIAN KASSITE FROM THE SARANOVSKOYE DEPOSIT, NORTHERN URALS, RUSSIA | |
dc.type | Статья |
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