metamorphic
Likely calcite-rich marble
Calcite (CaCO₃), recrystallized as marble; minor impurities may include mica or quartz
AI-generated identification · may be incorrectWhite to cream, sugary-granular texture with pearly to vitreous luster; calcite has Mohs hardness 3, rhombohedral cleavage, and commonly fizzes strongly with dilute hydrochloric acid. The specimen appears crystalline and fractured, but exact identification requires testing.
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Physical properties
White to cream, sugary-granular texture with pearly to vitreous luster; calcite has Mohs hardness 3, rhombohedral cleavage, and commonly fizzes strongly with dilute hydrochloric acid. The specimen appears crystalline and fractured, but exact identification requires testing.
Formation & geological history
Marble forms when limestone recrystallizes during regional or contact metamorphism, commonly in Paleozoic to younger metamorphic belts; its precise age cannot be determined from the image.
Uses & applications
Used as dimension stone, sculpture and architectural material, aggregate, and a source of lime; attractive pieces may be sold as decorative or educational specimens rather than jewelry gemstones.
Geological facts
Calcite is optically birefringent and can show double refraction through transparent pieces. White coloration typically reflects high calcite purity, while yellow or gray patches indicate impurities or weathering.
Field identification & locations
Look for a soft, light-colored crystalline texture, rhombohedral cleavage, and vigorous acid reaction; a steel knife can scratch it. Common worldwide in marble belts and limestone-related hydrothermal deposits.
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