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Dislocations and fault surfaces in natural apatite
Author(s) -
Phakey P. P.,
Leonard J. R.
Publication year - 1970
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/s0021889870005617
Subject(s) - burgers vector , dislocation , apatite , crystallography , crystal (programming language) , impurity , fault (geology) , materials science , diffraction , condensed matter physics , partial dislocations , mineralogy , geology , chemistry , physics , optics , computer science , seismology , quantum mechanics , programming language
The grown‐in defects in gem quality crystals of natural apatite have been investigated using X‐ray diffraction topography. The most common defects are the fault surfaces which are parallel to {101} growth horizons, and these fault surfaces result from the incorporation of impurities during the growth of the crystal. The dislocation density of the crystals is low. A majority of these dislocations align with [0001] and have Burgers vector b = c [0001]. Some dislocations make about 15° with [0001] and have a Burgers vector with a c ‐axis component, probably b = a + c 〈123 〉. A minority of the dislocations, nearly normal to the growth surfaces, have a mixed character with Burgers vector b = a 〈110〉.