Marble, not unlike granite, is also found in the ground and is 100% natural stone. Marble is formed when limestone is subjected to heat and pressure, a process known as metamorphism. Marble forms under metamorphism where large areas of Earth's crust converge. During metamorphism, the calcite in limestone recrystallizes to form marble that is a mass of interlocking calcite crystals. Marble is made up primarily of calcite and usually contains other minerals such as: clay minerals, micas, quartz, pyrite, iron oxides and graphite. Although most marbles don’t have a wide assortment of color like granite, marble is similar to granite in that it has its own look.
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