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Definition of euhedral

i. Said of a mineral grain that is completely bounded by its own rational crystal faces, and whose growth during primary crystallization or recrystallization was not restrained or interfered with by adjacent grains, and the faces not greatly affected by later physical or chemical erosion. It’s shape is due to the minerals own crystal forms and symmetry.

Ref: AGI

ii. Said of the shape of such a crystal.

Synonym of: idiomorphic, automorphic.

See also: anhedral, subhedral


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