Merohedry

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Mériédrie (Fr). Meroedrie (Ge). Meriedria (It). 欠面像 (Ja). Meroedria (Sp).

Definition

The point group of a crystal is called merohedry if it is a subgroup of the point group of its lattice. It is a hemihedry (tetartohedry, ogdohedry) if it is a subgroup of index 2 (4, 8) of the point group of its lattice.

See also