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noun Allomorph n. (Min.) (a)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. (b)A variety of pseudomorph which has undergone partial or complete change or substitution of material; thus limonite is frequently an allomorph after pyrite.
Collaborative International Dictionary of English 0.48
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