Marble????
March 8th, 2010 by admin
Why is only a few minerals found in marble?
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Well, marble by definition is primarily limestone that has gone through metamorphosis. Pure white marble is the result of metamorphism of very pure limestones. The characteristic swirls and veins of many colored marble varieties are usually due to various mineral impurities such as clay, silt, sand, iron oxides, or chert which were originally present as grains or layers in the limestone. Green coloration is often due to serpentine resulting from originally high magnesium limestone or dolostone with silica impurities. These various impurities have been mobilized and recrystallized by the intense pressure and heat of the metamorphism.
ummmm… i think its because it is a metamorphic rock that undergo metamorphism (heat and pressure)