A mineral or substance that differs in chemical composition from another but has the same crystalline form, representing a different atomic arrangement.
From Greek 'allo-' (other/different) and 'bar' from 'barytes' or weight, referring to varying densities and weights of chemically distinct minerals with similar structures.
Allomorphs are like mineral twins with different genetics—they look the same crystalline way but have completely different recipes chemically, which happens because atoms can shuffle around in different configurations!
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