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Twinning (endemic conditions of)

From Online Dictionary of Crystallography

 Geminazione (condizioni endemiche di) (It)

When a lattice necessarily contains at least one sublattice that supports either twinning by reticular merohedry or twinning by reticular pseudomerohedry, it is said that an endemic condition of twinning does exist. The following cases are known.

Rhombohedral lattice (hR)