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Growth defects in a quartz druse < a + c > dislocations
Author(s) -
Scandale E.,
Stasi F.,
Zarka A.
Publication year - 1983
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889883010687
Subject(s) - quartz , crystallography , materials science , chemistry , metallurgy
Growth defects have been studied by X‐ray topography in two natural quartz crystals from a Brasilian druse. Different types of defects have been observed and they showed similar configuration in both samples. Dislocations are analyzed and discussed. In particular, `pyramidal' dislocations with ( a + c ) Burgers vectors have been characterized: these uncommon dislocations are analyzed in detail because even today they are believed to be nucleated only by deformation processes. The observations, taken as a whole, indicate that defects of crystals from a druse present distinctive characteristics.