In the course of an investigation of the compressibility of minerals and rocks, L. H. Adams and E. D. Williamson,1 of this Laboratory, have examined the minerals which form the subjects of this paper. We have studied, optically and chemically, the specimens examined by them, so as to collate some of their properties. The results of our observations are presented here, in the belief that such determinations, made on identical material, may be of more general value than similar determinations made on materials which are not definitely identical.

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