Electron microscopy; proceedings of the Electron microscopy; proceedings of the Stockholm Conference, September, 1956 electronmicrosco00euro Year: 1957 Chemical Decomposition of Crystals of Explosive Materials 343 microscope. Type I diamonds show a conchoidal type of cleavage surface with local changes in height of several microns: type II diamonds show much smoother cleavage surfaces which do, however, have a considerable amount of tine structure ranging up to perhaps 1500 A in depth, with a few larger steps of a micron or more crossing the surface. Regions similar in appearance to type II c
Electron microscopy; proceedings of the Electron microscopy; proceedings of the Stockholm Conference, September, 1956 electronmicrosco00euro Year: 1957 Chemical Decomposition of Crystals of Explosive Materials 343 microscope. Type I diamonds show a conchoidal type of cleavage surface with local changes in height of several microns: type II diamonds show much smoother cleavage surfaces which do, however, have a considerable amount of tine structure ranging up to perhaps 1500 A in depth, with a few larger steps of a micron or more crossing the surface. Regions similar in appearance to type II cleavage surfaces have been found on a type I diamond. It is believed that this is due to real inhomogeneity in the diamond. The results are in agreement with those obtained by other workers and, in particular, with those obtained by Wilks (II) in a recent interferometric study of diamond surfaces.' ' The above results are in agreement with some observa- tions made by Custers (unpublished) on the inhomogeneity in the optical properties of diamonds. He observed that, under ultra violet irradiation, some diamonds fluoresced strongis in parts and were non-fiuorescent in others. These diamonds showed local ditVerences in transparency below 3000 A. One diamond in particular showed inhomogeneity in the visible part of the spectrum, being partly blue and partly white with a clear boundary between the two regions. The author thanks Dr. F. P. Bowden, , , for his advice and encouragement, and Messrs. Industrial Distributors (1946) Ltd. for a research grant and for the loan of the diamonds. RtFERENCES 9. 10. AiitAKN, A. J., Phys. Rev. 96, 828 (1954). Champion, F. C, Proc. Roy. Sue. A 220, 485 (1953). — ibid. 234, 541 (1956). CottRiNE ^-Pkai r, J. S., Mfntfr, J. W., and Sial, M., Proc. 3rd Intern. Conf. Elect. Microsc. London 1954. CusTFRS, J. F. H., 4, 131 (1951). Ramachandran, G. N., Proc. Iiulian Acad. Sci. A 24, 65 (1946). Robertson, R., Fox, J. J., and Marmn, A
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