metamorphic
White marble
Calcite marble (predominantly CaCO₃)
AI-generated identification · may be incorrectTypically white to pale gray, sugary crystalline texture, vitreous to pearly luster, and Mohs hardness 3; calcite crystals show rhombohedral cleavage and fizz with dilute hydrochloric acid. The specimen appears fine- to medium-grained and possibly weathered or lightly polished.
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Physical properties
Typically white to pale gray, sugary crystalline texture, vitreous to pearly luster, and Mohs hardness 3; calcite crystals show rhombohedral cleavage and fizz with dilute hydrochloric acid. The specimen appears fine- to medium-grained and possibly weathered or lightly polished.
Formation & geological history
Forms when limestone or dolostone is recrystallized by regional or contact metamorphism, commonly during mountain-building; its exact geological age cannot be determined from the image. Common sources include Italy, Greece, Vermont, Turkey, and India.
Uses & applications
Used as dimension stone, sculpture and architectural facing, aggregate, and occasionally as a decorative lapidary material. High-quality white marble is valued for statuary and countertops.
Geological facts
Marble is a rock rather than a single mineral, though calcite is usually dominant; dolomitic marble contains substantial dolomite. Its white color generally reflects low impurity content.
Field identification & locations
Identify it by its white crystalline mosaic, softness, and acid effervescence; a steel nail can scratch it, while quartz cannot. Confirm with acid testing and a fresh surface, since coatings or dust may obscure texture.
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