Percussion Figure

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percussion figure [pər′kəsh·ən ‚fig·yər]

(crystallography)

Radiating lines on a crystal section produced by a sharp blow.

Percussion Figure

an arrangement of cracks on the face of a crystal, formed by the sharp impact of the blunted point of a steel center punch. The shape of a percussion figure reflects the symmetry of the crystal and the anisotropy of the crystal’s tensile strength.

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