From Online Dictionary of Crystallography
Revision as of 10:55, 19 May 2017 by BrianMcMahon (Style edits to align with printed edition)
Plan d'accollement, surface d'accollement (Fr). Piano di composizione, superficie di composizione (It). 接触面 (Ja).
The surface that separates two individuals (domains) in a twin is called composition surface or, when it has the regular shape of a plane, composition plane. The former is characteristic of penetration twins, the latter of contact twins.