Basal cleavage

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Related to Basal cleavage: Prismatic cleavage, pinacoidal cleavage
See under Cleavage.
cleavage parallel to the base of a crystal, or to the plane of the lateral axes.

See also: Basal, Cleavage

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References in periodicals archive ?
The reason for natural corundum being particularly suitable for grinding is its prominent basal cleavage that causes the crystal to break readily with a smooth flat surface at right angles to the axis of elongation through successive reductions in size unlike synthetic corundum (alumina), which has a conchoidal fracture.
Although highly resistant to grinding and cutting, beryl does have a weakly developed basal cleavage.