Marble

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Marble is a metamorphic rock consisting of carbonate minerals, most commonly calcite (CaCO3) or dolomite (CaMg(CO3)2), that have recrystallized under the influence of heat and pressure. It has a crystalline texture, and is typically not foliated (layered), although there are exceptions. In geology, the term marble refers to metamorphosed limestone, but its use in stonemasonry more broadly encompasses unmetamorphosed limestone. Pure white marble arises from very clean limestone or from dolomite rock. However, its signature veins and swirls result from impurities, for example clay, sand, iron oxides, or chert that were originally present in the protolith—magnesium-rich varieties may show green tones due to serpentine. These impurities are redistributed and recrystallized during metamorphism. Due to its hardness, durability and resistance to temperature, marble is often used in sculpture and construction. In sculpture, marble is ideal for fine detail due to its uniform grain, moderate...

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