Also parallel to the principal axis is one direction of perfect cleavage.

It has one direction of perfect cleavage and exhibits conchoidal fracture.

Because of diamond's perfect and easy cleavage, it is vulnerable to breakage.

It is black in color with a glassy luster and a near perfect cleavage.

It has perfect cleavage in two directions and a brittle fracture.

It has perfect cleavage, a pearly luster and leaves a white streak.

Arctite has a perfect cleavage and a trigonal crystal system.

Mica includes several closely related materials having perfect basal cleavage.

Barytocalcite has at least one perfect and one imperfect cleavage.

It is triclinic, has one direction of perfect cleavage, and may be white, yellow or green.