Similarity in cry stalline form. Also, the replacement of one element in a crystalline salt by another, without alteration of form or system. I., Heteromer- ous, a condition of dissimilarity in molecular composition. I., Isomerous, a condition of similarity in molecular composition. I., Polymeric, the substitution of two or more atoms of one element for one of another, without alteration of crystalline form.

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Definition of  ISOMORPHISM