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Mineralogical ClassificationVlasovite structure refinement: abstract
8th Jan 2004 16:01 UTCMarco E. Ciriotti
New Data on Vlasovite: Refinement of the Crystal Structure and the Radiation Damage of the Crystal during the X-ray Diffraction Experiment
E. R. Gobechiya,1 I. V. Pekov,1 D. Yu. Pushcharovski,1,2 G. Ferraris,3 A. Gula,3 N. V. Zubkova,1 and N. V. Chukanov4
The crystal structure of vlasovite obtained from the Kipawa alkaline complex in Quebec is refined to RF = 0.053 for 1515 unique reflections with |F |> 4(F). The parameters of the monoclinic unit are as follows: a = 11.063(8) Å, b = 10.15(1) Å, c = 8.60(1) Å, = 100.3(1)°, space group C2/c, and Z = 4. The X-ray diffraction, electron microprobe, and IR spectroscopic data indicate that, under X-ray radiation, the specimen suffers radiation damage, which is accompanied by a partial removal of Na atoms, incorporation of H2O molecules into the structure, and, possibly, a change in the configuration of the (Si,O) framework.
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