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Plane indices naming a preferred break.
Also known as: Preferred fracture plane, Cleavage direction notation
The notation giving the crystallographic plane along which a crystal preferentially splits, written as a Miller index.
Gives the crystallographic plane along which a crystal preferentially splits.
Contexts: Laboratory
Uses the same index notation as any other plane, so a cleavage is recorded as a fact about a plane the notation already names rather than in a vocabulary of its own.
Contexts: Laboratory
A three-figure plane index in round brackets, sometimes qualified by a word grading how easily the crystal splits along it.