Hemihedry
From Online Dictionary of Crystallography
Hémiédrie (Fr). Hemiedrie (Ge). Emiedria (It). 半面像 (Ja). Hemiedría (Sp).
Definition
The point group of a crystal is called hemihedry if it is a subgroup of index 2 of the point group of its lattice.
See also
- Chapter 3.2.1.1 of International Tables for Crystallography, Volume A, 6th edition