From Online Dictionary of Crystallography
Revision as of 16:25, 16 May 2017 by BrianMcMahon (Edits to align with printed edition)
Macle par reflexion (Fr). Geminato per riflessione (It).
1. Rational twin mirror plane normal to an irrational line. This lattice plane is common to both twin partners.
2. Irrational twin mirror plane normal to a rational lattice row. This lattice row [uvw] is common to both twin partners.