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A look at a classic stone

From the shimmering aura of the Taj Mahal to the humble floor of your home’s bathroom, marble is one of the world’s most revered and useful natural materials. Marble is Michelangelo’s David, the Washington Monument, and the Duomo of Florence. It is also the primary ingredient in Tums antacid. The mineral content of marble is the same as the limestone it came from, and both of these stones are made of calcite, AKA calcium carbonate. Calcite is one of the more common minerals on Earth’s surface; in addition to limestone and marble, calcite is the primary ingredient in travertine and onyx.