An axial plane is a plane which divides the body into superior and inferior parts, at roughly perpendicular angles to the spine. The most commonly used terms for specific axial planes are the transverse plane, the coronal plane, and the sagittal plane.

Quartz has a conchoidal fracture. It does not have a cleavage plane.

The value for the cleavage plane (100) is 38 GPa and the value for the cleavage plane (001) is 33 GPa.

none there is none its 0 none

This could be a beading plane, a plane of cleavage or schistosity, or a fault plane.