Zippeite from Cap Garonne, France: an example of reticular twinning
| Autor: | Jakub Plášil, Valérie Galéa-Clolus, Stuart J. Mills, Václav Petříček, Georges Favreau |
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| Rok vydání: | 2018 |
| Předmět: |
Inorganic Chemistry
Materials science Reticular connective tissue Geochemistry General Materials Science 010502 geochemistry & geophysics 010403 inorganic & nuclear chemistry Condensed Matter Physics Crystal twinning 01 natural sciences Zippeite 0104 chemical sciences 0105 earth and related environmental sciences |
| Zdroj: | Zeitschrift für Kristallographie - Crystalline Materials. 233:861-865 |
| ISSN: | 2196-7105 2194-4946 |
| Popis: | We describe here the case of twinning by reticular (pseudo)merohedry in case of natural zippeite crystal from Cap Garonne, France. The twin is by two-fold rotation in [100] and it is a first document of this type of twinning in zippeite-related minerals and compounds. Zippeite crystals from Cap Garonne mine, France, were studied by single-crystal X-ray diffraction [a=8.7243(4), b=13.9337(7), c=8.8741(4) Å, β=104.243(5) and V=1045.59(9) Å3, Z=2, in C2/m]; refinement taking into account of the twinning resulted in R=2.81% for 1596 reflections with [I>3σ(I)] and refined twin fraction 0.7773(9):0.2227(9). |
| Databáze: | OpenAIRE |
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