Crystal structure of cronstedtite-6T.sub.2./sub., a non-MDO polytype

0470158 - FZÚ 2017 RIV DE eng J - Článek v odborném periodiku
Hybler, Jiří
Crystal structure of cronstedtite-6T₂, a non-MDO polytype.
European Journal of Mineralogy. Roč. 28, č. 4 (2016), s. 777-788. ISSN 0935-1221. E-ISSN 1617-4011
Grant CEP: GA ČR GA15-04204S
Institucionální podpora: RVO:68378271
Klíčová slova: cronstedtite * 1:1 layer silicate * polytypism * non-MDO polytype 6T₂ * crystal structure
Kód oboru RIV: DB - Geologie a mineralogie
Impakt faktor: 1.362, rok: 2016

The crystal structure of cronstedtite-6T2, a new polytype of the 1:1 layered silicate, was refined using a crystal from the occurrence in Pohled, Czech Republic. The space group is P31, lattice parameters a=5.4976(3), c=42.601(1) Å, Z=6, composition (Fe2+2.515 Fe3+0.485) (Si1.515 Fe3+0.485) O5 (OH)4, Robs = 4.13% for 3244 independent reflections. Positions of all atoms including hydrogens are referred, geometries of tetrahedra, octahedra, and interlayer hydrogen bonds are described. Cronstedtite-6T2 is a non-MDO polytype, since more than one kind of layer triplets can be found in the stacking sequence.
Trvalý link: http://hdl.handle.net/11104/0267872