# Difference between revisions of "Twin index"

### From Online Dictionary of Crystallography

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= Twin index = | = Twin index = | ||

− | A twinning operation overlaps both the direct and reciprocal lattices of the individuals | + | 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 ([[overlap of lattices]]). The reciprocal ''n'' of the fraction 1/''n'' of (quasi)restored nodes is called ''twin index'' |

## Revision as of 15:48, 21 April 2006

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 (overlap of lattices). The reciprocal *n* of the fraction 1/*n* of (quasi)restored nodes is called *twin index*