Crystal structure analysis of pezzottaite and its implication

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Marco E. Ciriotti
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Crystal structure analysis of pezzottaite and its implication

Messaggio da Marco E. Ciriotti » ven 08 feb, 2019 10:09

▪ Liu, S.-I, Li, G., Peng, M. (2018): Crystal structure analysis of pezzottaite and its implication. Acta Mineralogica Sinica, 2008, 575.

CCD single-crystal X-ray diffractometer was employed to analyze the crystal structure of pezzottaite with space group = R3c. The variation characteristics of c/a ratio of unit cell, which is caused by the regular replacement of Li+ to Be2+ in the structure, has been discussed. In contrast with the detected space group of the crystal, the newly discovered ditrigonal scalenohedral negative crystal inclusions showed the m symmetry of the crystal with space group symmetry R-3c. Our structural analysis of pezzottaite revealed that the previous assumption of the space group (R-3m) of the crystal was incorrect. Further experiments are required to determine the true space group (R-3c or R3c) of pezzottaite and reveal whether it has the symmetrical centre or not.
Marco E. Ciriotti

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