The structure of reyerite, (Na,K)2Ca14Si22A12058(OH)8.6H20
The crystal structure of reverite, (Na,K)~Ca14Si22AI2Oss(OH)8.6H20, Z = 1, was refined in the space group P3, a = 9.765, c = 19.067/k, to R = 0.064 for 1540 reflections. The structure fs composed of the following structural units: (a) tetrahedral sheets $1, with composition (Si8020) 8-, characterize...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.619.9106 http://www.minersoc.org/pages/Archive-MM/Volume_52/52-365-247.pdf |
| Summary: | The crystal structure of reverite, (Na,K)~Ca14Si22AI2Oss(OH)8.6H20, Z = 1, was refined in the space group P3, a = 9.765, c = 19.067/k, to R = 0.064 for 1540 reflections. The structure fs composed of the following structural units: (a) tetrahedral sheets $1, with composition (Si8020) 8-, characterized by six-membered rings of tetrahedra; (b) tetrahedral sheets $2, characterized by six-membered rings of tetrahedra, with six tetrahedra pointing in one direction and two pointing in the other direction--the apical oxygens of these two tetrahedra connect wo inversion-related S 2sheets to build $2S2 double sheets, with composition (8i14A12038) 14- and ordered distribution of aluminum cations; (c) sheets O of edge-sharing calcium octahedra. The various structural units are connected through corner sharing according to the schematic sequence.0S10S2,~20.; the corresponding composition is [Ca14Si22AI2058(OH)8] 2-. The charge balance is restored by alkali cations which are placed, together with water molecules, in the cavities of the structure at the level of the double tetrahedral sheet. |
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