gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1963.033.262.06 An Unusual Distribution of Precipitates in a Diamond Shah C. J. M.Sc., Ph.D. Royal Holloway College, University of London1 Lang A. R. M.Sc., Ph.D., A.Inst.P. H. H. Wills Physics Laboratory, University of Bristol

Present Address: Technological Laboratory, Adenwala Road, Bombay 19, India.

 9 1963 33 262 594 599 Copyright © 1963, The Mineralogical Society 1963 Summary

The central region of a type 1 stone was found by optical and X-ray topographic examination to be densely populated with small inclusions. The X-ray studies indicated that these were precipitates formed after growth of the stone. Precipitate sizes fell into two groups, 1 µ or less, and around 5 µ. Many cases of decoration of grown-in dislocations by these precipitates were observed.