Zippeite from Cap Garonne, France: an example of reticular twinning
-
Jakub Plášil
,
Václav Petříček
Abstract
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).
Acknowledgements
Pierre-Jacques Chiappero is thanked for providing the scintillometer used for locating the area of discovery of the studied sample. Vincent Bourgoin and Jean-Claude Boulliard, from Association Jean Wyart, Paris, are thanked for the preliminary EDX analysis of the material. Comments of two anonymous referees helped improving the manuscript. This research was supported by the project No. LO1603 under the Ministry of Education, Youth and Sports National sustainability program I of the Czech Republic.
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Supplementary Material
The online version of this article offers supplementary material (https://doi.org/10.1515/zkri-2018-2082).
©2018 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Graphical Synopsis
- Recent advances in the chemistry of uranium halides in anhydrous ammonia
- The correct symmetry of the six-fold twin in β-Ca11B2Si4O22
- The allotwinning of KCa3Te5O12Cl3: an OD interpretation
- Zippeite from Cap Garonne, France: an example of reticular twinning
- Structural studies on copper and nitrogen doped nanosized anatase
- Low-dimensional compounds containing cyanido groups. Part XXXIV. Structure, spectral and magnetic properties of the first complex with pyridylbenzimidazole and nonlinear pseudohalide anion
Artikel in diesem Heft
- Frontmatter
- Graphical Synopsis
- Recent advances in the chemistry of uranium halides in anhydrous ammonia
- The correct symmetry of the six-fold twin in β-Ca11B2Si4O22
- The allotwinning of KCa3Te5O12Cl3: an OD interpretation
- Zippeite from Cap Garonne, France: an example of reticular twinning
- Structural studies on copper and nitrogen doped nanosized anatase
- Low-dimensional compounds containing cyanido groups. Part XXXIV. Structure, spectral and magnetic properties of the first complex with pyridylbenzimidazole and nonlinear pseudohalide anion
