Hemihedry

From Online Dictionary of Crystallography

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Hémiédrie (Fr). Hemiedria (Sp). Emiedria (It). 半面像 (Ja)

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

Section 9.1 of International Tables of Crystallography, Volume A

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Fundamental crystallography