Abstract
THE interpretation of powder patterns of soaps and other long-chain aliphatic compounds which cannot be obtained as single crystals is not easy and is usually ambiguous1. Samples of calcium stearate monohydrate prepared by D. Wallace using the method of Vold, Hattiangdi and Vold2 were recrystallized from solution in a mixture of propylene glycol and chloroform. The recrystallized soap was in the form of very tiny laths which could be formed into highly orientated sheets by sedimentation or by flotation. Such a specimen, mounted on a glass plate, used in a Geiger-counter diffractometer, gives rise to the long-spacing peaks of spacing d = 50.30 A. from planes parallel to the plane of the specimen and no other peaks.
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