Discussion
Foliation in a metamorphic rock is produced chiefly by
Answer: B
Correct answer: directed pressure aligning platy minerals
Foliation requires two things: pressure that is greater in one direction than another, and minerals with a platy or elongate habit - the micas and amphiboles - that can rotate and grow perpendicular to the maximum stress. The result is a planar fabric along which the rock splits. Uniform pressure produces no preferred direction, and a rock of one equidimensional mineral cannot develop one at all.
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