Cleavage is due to the crystal structural plane and the strength of the crystal which is the result of the strength of the bonds. The crystalline material can split parallel to planes of weakness with the crystal structure when force is applied in the right direction with the appropriate force.
Cleavage is directional breakage, along particular planes of atomic bonding in a crystalline material. Diamonds have four cleavage directions, parallel to to planes of weakness with the crystal
It refers to the directional durability, hardness, and toughness of a diamond mineral and the atomic bonding of that crystal structure of that diamond (rough or polished).
Cleavage can not occur in amorphous material such as glass.
The cleavage planes in a diamond are octahedron in orientation. They are parallel to the octahedral faces of the diamond crystal.
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