Discussion
Non-foliated metamorphic rocks such as marble and quartzite lack foliation because their parent rock was
Answer: B
Correct answer: essentially of one mineral, with no platy minerals to align
Marble is almost all calcite and quartzite almost all quartz, and both minerals are equidimensional rather than platy, so directed pressure has nothing to align and the rock recrystallises into an interlocking mosaic instead. Foliation requires micas or amphiboles to rotate and grow, which is why it develops in metamorphosed shales and not in metamorphosed limestones or sandstones.
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