Allomorph

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Allomorph

(Science: chemical) Any one of two or more distinct crystalline forms of the same substance; or the substance having such forms; as, carbonate of lime occurs in the allomorphs calcite and aragonite.

a variety of pseudomorph which has undergone partial or complete change or substitution of material; thus limonite is frequently an allomorph after pyrite.

Origin: gr. Other _ form.