Twin index

From Online Dictionary of Crystallography

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Indice de macle (Fr). Indice di geminazione (It)

Twin index

A twinning operation overlaps both the direct and reciprocal lattices of the individuals that form a twin; consequently, the nodes of the individual lattices are overlapped (restored) to some extent (twinning (effects of)). The reciprocal n of the fraction 1/n of (quasi)restored nodes is called twin index

Chapter 3.3 of International Tables of Crystallography, Volume D