A discussion of the use of the electron microscope in mineralogic studies and of sample preparation is followed by a series of electron photomicrographs showing the size, shape, and crystal habit of fine fractions of some uranium-bearing minerals from the Colorado Plateaus, lignite from North and South Dakota, phosphate minerals from Florida, and minerals synthesized in the laboratory. The information obtained from these photographs is useful in establishing paragenetic relations of associated minerals in uranium deposits, in supplementing mineralogic descriptions, and in guiding and checking separation techniques.

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