Morphotypes of the quartz basic rhombohedra and crystallization conditions

An analysis of the combinatorial–morphological types of faceting for a quartz crystal head has provided 23 types of combinations of faces of basic positive and negative quartz rhombohedra, among which three full-face morphotypes are generally observed under natural conditions. The theoretical occurr...

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Bibliographic Details
Published in:Crystallography reports 2017-07, Vol.62 (4), p.511-521
Main Author: Rakin, V. I.
Format: Article
Language:English
Subjects:
Combinatorial analysis
Crystallization
Crystallographic Symmetry
Crystallography and Scattering Methods
Morphology
Parameter estimation
Physics
Physics and Astronomy
Quartz
Quartz crystals
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Summary:An analysis of the combinatorial–morphological types of faceting for a quartz crystal head has provided 23 types of combinations of faces of basic positive and negative quartz rhombohedra, among which three full-face morphotypes are generally observed under natural conditions. The theoretical occurrence rates are obtained for these morphotypes under isotropic growth conditions, and a morphological analysis is performed over seven samples of natural quartz crystals. A method is proposed for estimating some most important parameters of the crystal formation system: the ratio of variation in the central distances to the faces of crystal rhombohedra, which is related to its growth rates; the ratios of the intermediate growth rates of the rhombohedra and prism, the index of infection with Dauphiné twins, and the feed dissymmetry factor.
ISSN:1063-7745
1562-689X
DOI:10.1134/S1063774517030191