Foliation is exhibited most prominently by sheety minerals such as mica or chlorite however foliation is most well developed that is the rock layers have experienced the greatest amount of flattening in the gneisses and other coarse grained rocks of high metamorphic grade which form under high pressure and in temperatures above 320 c 608 f. Commercially it includes all decorative calcium rich rocks that can be polished as well as certain serpentines verd antiques. Low grade metamorphic rocks are characterized by an abundance of hydrous minerals minerals that contain water h 2 o in their crystal structure.
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