Also euhedral. (in a rock) noting or pertaining to a mineral constituent having its own characteristic outward crystalline form unaltered by the other constituents of the rock; automorphic.
having its own characteristic form.
Origin of idiomorphic
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Idiomorphic, id-i-o-mor′fik, adj. having a peculiar or distinctive form.
Typical nepheline-dolerites are scarce, and consist of idiomorphic augite, surrounded by nepheline.
(of minerals) occurring naturally in the form of well-developed crystals
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