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The reversion of smoky quartz coloration in crystals with induced growth striations
Author(s) -
Bernhardt H.J.
Publication year - 1985
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170200313
Subject(s) - quartz , diffusion , crystal (programming language) , crystal growth , reversion , materials science , crystallography , optics , condensed matter physics , chemistry , mineralogy , chemical physics , physics , composite material , thermodynamics , biochemistry , phenotype , computer science , gene , programming language
Induced growth striations in quartz crystals grown from Al‐containing material have been investigated after X‐raying them. Earlier results (Bernhardt, Alter) showed that the stripes may occur as strong colored ones on a light background or as light stripes on high coloration background. This behaviour depends on the growth region regarded, and the applied X‐ray dose. The position of the stripes may become displaced in dependence of the X‐ray dose. The present paper developes a model which may describe this effect only using the diffusion law, the smoky quartz centre model according O'Brien and the Al 3+ /Na + ‐distribution in the crystal. Our results must be taken into account when interpreting the growth striations.