THE CRYSTAL STRUCTURE OF CALCIUM CATAPLEIITE
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dc.contributor.author | Merlino S. | |
dc.contributor.author | Pasero M. | |
dc.contributor.author | Bellezza M. | |
dc.contributor.author | Pushcharovsky D.Yu. | |
dc.contributor.author | Gobetchia E.R. | |
dc.contributor.author | Zubkova N.V. | |
dc.contributor.author | Pekov I.V. | |
dc.date.accessioned | 2022-11-03T10:21:08Z | |
dc.date.available | 2022-11-03T10:21:08Z | |
dc.date.issued | 2004 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=13456916 | |
dc.identifier.citation | The Canadian Mineralogist, 2004, 42, 4, 1037-1045 | |
dc.identifier.issn | 0008-4476 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/39374 | |
dc.description.abstract | Calcium catapleiite, CaZrSi3O9•2H2O, the calcium-dominant analogue of catapleiite, Na2ZrSi3O9•2H2O, firstly described as hexagonal, space group P63/mmc, with a 7.32, c 10.15 A, is actually orthorhombic, space group Pbnn, a 7.378(1), b 12.779(1), c 10.096(1) A, V 951.89 A 3 and Z = 4. The crystals display three-fold twinning (“Drilling”) about the c axis, with the three individuals rotated 120° one from the other. The crystal structure of calcium catapleiite from the type locality, the Burpala massif, northern Baikal Region, Siberia, Russia, has been determined by direct methods from single-crystal X-ray-diffraction data and refined to a final R = 0.0528 (wR 2 = 0.1604) for 2167 reflections with Fo > 6� (Fo). It is characterized by a mixed framework of regular [ZrO6] octahedra and three-membered silicate rings [Si3O9], very similar to the framework of catapleiite. The H2O molecules also are similarly placed in the two minerals. The Ca 2+ cations in calcium catapleiite are distributed over two distinct sites, with 0.8 and 0.2 occupancies, which contrasts with the fully disordered distribution of the Na + cations in catapleiite. | |
dc.subject | calcium catapleiite | |
dc.subject | crystal structure | |
dc.subject | ring silicate | |
dc.subject | syenitic pegmatite | |
dc.subject | Burpala massif | |
dc.subject | Russia | |
dc.title | THE CRYSTAL STRUCTURE OF CALCIUM CATAPLEIITE | |
dc.type | Статья |
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