metamorphic
Marble
Metamorphosed Limestone (CaCO3)
Hardness of 3 on the Mohs scale, typically white or colored with distinctive veins (relic bedding or mineral impurities), greasy to vitreous luster, fine to coarse crystalline structure, specific gravity around 2.55-2.75.
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Physical properties
Hardness of 3 on the Mohs scale, typically white or colored with distinctive veins (relic bedding or mineral impurities), greasy to vitreous luster, fine to coarse crystalline structure, specific gravity around 2.55-2.75.
Formation & geological history
Formed through regional or contact metamorphism of sedimentary carbonate rocks (mostly limestone or dolostone) under high heat and pressure, recrystallizing the calcite grains.
Uses & applications
Extensively used in sculpture, architecture, flooring, countertops, and monumental buildings due to its aesthetic appeal and workability.
Geological facts
Pure marble is white, but impurities such as clay, silt, sand, or iron oxides give rise to the varied colors and dramatic veining patterns. Famous historical structures like the Taj Mahal and Michelangelo's David are carved from marble.
Field identification & locations
Easily identified by its characteristic softness (scratched by a knife), reactivity with acid (fizzing with dilute hydrochloric acid due to calcium carbonate), and crystalline texture.
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