isomorphous

(i-s0-mér’fus), a. [ equal, + jop¢7, form.] Exhibiting the property of isomorphism. Also isomorphic. Notwithstanding the po ibility, in the case of certain carbonates, of substituting ¢so morpho us constituents for one another, it cannot be pretended that any evidence as yet breaks down the list of chemical elements. J. Martin eau, Materialism, p. 127. Isomorphous group. (a) A group of substances having analogous composition and closely related crystalline form. Thus, in mineralogy, the carbonates of calcium, magnesium, iron, manganese, and zinc (respectively CaCO3, MgCOx, FeCOg, MnCOg, ZnCOg) form an isomorphous group, all crystallizing in the rhombohedral system, and with nearly the same angles, the angle of the cleavage rhombohe- 540 isomorphous 3198 dron varying from 105° to 107}°.. Between the members isophorous (i-sof’d-rus), a. [