Marble

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Marble is a metamorphic rock that forms when limestone is subjected to the heat and pressure of metamorphism. It is composed primarily of the mineral calcite (CaCO3) and usually contains other minerals, such as clay minerals, micas, quartz, pyrite, iron oxides, and graphite. Under the conditions of metamorphism, the calcite in the limestone recrystallizes to form a rock that is a mass of interlocking calcite crystals.  From Greek statues to Roman baths, it has been used for centuries in just about every possible interior and exterior application. Marble is relatively hard, but not as hard as granite.  The calcite in marble is what reacts with acid which can cause it to stain, etch or scratch.  Marble is generally thought to be from Italy, but in actuality it is quarried all over the world.

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