hemimorphic

/ˌhɛmɪˈmɔrfɪk/
adjective
  1. Describing a crystal that has different forms or faces at opposite ends, so that it is not symmetrical.
    • Mineral collectors prize hemimorphic crystals for their unusual shape.
    • The hemimorphic crystal of tourmaline has different faces at its two ends.
    • In geology class, we learned that hemimorphic crystals lack a center of symmetry.
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