metamorphic
Marble
Metamorphosed Limestone (primarily calcite CaCO3 or dolomite CaMg(CO3)2)
Hardness of 3 on the Mohs scale, color typically white, gray, or pink with characteristic veining (due to mineral impurities), luster ranges from sugary to vitreous or pearly, crystal structure is a fine to coarse-grained mosaic of calcite crystals, specific gravity is 2.55-2.71.
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Physical properties
Hardness of 3 on the Mohs scale, color typically white, gray, or pink with characteristic veining (due to mineral impurities), luster ranges from sugary to vitreous or pearly, crystal structure is a fine to coarse-grained mosaic of calcite crystals, specific gravity is 2.55-2.71.
Formation & geological history
Formed through regional or contact metamorphism of sedimentary carbonate rocks (mostly limestone or dolostone) under high temperature and pressure, recrystallizing the original carbonate minerals.
Uses & applications
Widely used in sculpture, architecture, interior decoration, flooring, monuments, and as a source of calcium.
Geological facts
Marble has been used since classical antiquity for statues and buildings (such as the Parthenon and the Taj Mahal). When pure, marble is completely white.
Field identification & locations
Identified in the field by its characteristic softness (easily scratched with a knife), reaction with dilute hydrochloric acid (effervescence), and interlocking crystalline texture. Found worldwide where ancient limestone deposits have undergone metamorphism.
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