hemimorphism
hemimorphism The property of certain crystals in which there is no element of symmetry present to cause the repetition of upper-hemisphere faces in the lower hemisphere. A good example is tourmaline, where there are no horizontal axes of symmetry or centre of symmetry, but only one vertical axis of three-fold symmetry and three vertical planes of symmetry.
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Note: This article, originally published in 1998, was updated in 2006 for the eBook edition.
Overview
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hemimorphism