TWIN CRYSTALS
\twˈɪn kɹˈɪstə͡lz], \twˈɪn kɹˈɪstəlz], \t_w_ˈɪ_n k_ɹ_ˈɪ_s_t_əl_z]\
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Two crystals joined together in such a way that one would come into the position of the other by revolving it through two right angles round an axis, the T. axis, perpendicular to a plane, the T. plane, which either is or may be a face of either crystal.
By Henry Percy Smith
