In the January (1923) number of The American Mineralogist Dr. E. T. Wherry has expounded his interesting and suggestive views on “Volume Isomorphism in Silicates,” the fundamental idea being that atoms that have approximately equal volumes can replace each other “isomorphously,” while those with widely different volumes cannot. Wherry minimizes the importance of valency in such isomorphous replacement and disbelieves in the necessity of equality in the sums of the valencies of the replacing atoms.

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