DuckCorp Dico

Found one definition

1.                 From English - German Ding/FreeDict dictionary ver. 1.9-fd1:
                   
   
   
                   
                     
   geminate crystals /dʒˈɛmɪnˌeɪt kɹˈɪstəlz/
   Zwillingskristalle <pl>
      Synonyms: twin crystals, compound crystals, macles, hemitropes
    see: twin crystal, compound crystal, geminate crystal, macle, hemitrope