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The texture of a rock with aligning parallel platy grains is said to exhibit metamorphic foliation.
foliation
foliation
foliated
foliated
foliated
Mica.
Mica.
The rocks tend to spilt along parallel planes defined by distribution and parallel arrangment of platy mineral crystals.
The foliation is caused by the massive force of pressure and high temperature which results from mountain building processes caused by plate collisions. The heat and pressure combine to realign the existing minerals from a random orientation to one of parallel orientation, thus creating the visible lines or platy cleavages found in foliated metamorphic rocks. The lines of foliation are created perpendicularly to the force being applied.
Answer It is the platy's waste.
Slaty foliation, is a type of parallel foliation consisting of fine-grained platy minerals. The direction of foliation is usually perpendicular to the direction of maximum stress.