Commercially it includes all decorative calcium rich rocks that can be polished as well as certain serpentines verd antiques. Marble granular limestone or dolomite i e rock composed of calcium magnesium carbonate that has been recrystallized under the influence of heat pressure and aqueous solutions. 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.
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