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Mineralogical ClassificationStructure of chlorartinite

20th Sep 2006 13:02 UTCUwe Kolitsch Manager

K. Sugimoto, R. E. Dinnebier and T. Schlecht (2006): Chlorartinite, a volcanic exhalation product also found in industrial magnesia screed J. Appl. Crystallogr. 39, 739-744.

The volcanic exhalation product chlorartinite, Cl•H2O, has recently been found to be a minor, and in some samples a major, component of magnesia floors for industrial use. In order to be able to perform quantitative phase analysis using the Rietveld method, its crystal structure was determined from high-resolution synchrotron powder diffraction data by the global optimization technique of simulated annealing and Rietveld refinement. The final Rp and Rwp values are 5.23% and 6.56%, respectively. Chlorartinite crystallizes in the rhombohedral space group R3c (No. 161), with a = 23.14422 (16) Å, c = 7.22333 (5) Å, V = 3350.84 (5) Å3, Z = 18. The building units of chlorartinite consist of MgO6 octahedra forming 15-membered puckered rings which are interconnected by CO3 triangular moieties. The rings are stacked to form a honeycomb-like three-dimensional framework structure with large isolated channels. Within the channels, free chlorine atoms and disordered water molecules are located.


Mineral file has been updated.

26th Sep 2006 19:59 UTCPeter Haas

Free chlorine atoms ???


Shouldn't it be chloride ions ?

27th Sep 2006 10:54 UTCUwe Kolitsch Manager

Certainly ("free" is misleading).
 
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