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X-ray powder studies on about fifty specimens of rather highly crystalline chlorites from Japan revealed the exsistence of two type of elementary cells, one with a 14A-monoclinic and the other with a 14A-ortho-hexagonal symmetry, and that the patterns of the former type are closely similar to one another, but those of the latter type vary from one another in detail. The monoclinic type ranges from Mg-rich chlorite to Fe-chlorite while the ortho-hexagonal type appears to be limited to Fe-rich members, but a Mgrich specimen seems to have the latter type cell. The interference colors of the monoclinic types are frequently abnormal (usually for Fe-chlorite), the ortho-hexagonal types, however, usually show normal interference color, so that these two types are generally distinguishable under the microscope.

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