metamorphic

Polished natural stone slab, likely marble

Calcite-rich marble (predominantly calcite, CaCO₃); exact identification requires testing

AI-generated identification · may be incorrect

White to pale gray with irregular dark-gray veining and cloudy patches; polished, with a vitreous to soft luster. Calcite has Mohs hardness 3, trigonal crystal structure, and perfect rhombohedral cleavage; marble typically has a granular mosaic texture.

Identified September 23, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when limestone or dolostone recrystallized during metamorphism; marble ranges from ancient to geologically recent and commonly occurs in regional metamorphic belts.

Uses & applications

Used for interior cladding, flooring, countertops, sculpture, and decorative stone; calcite marble is generally unsuitable for acids or harsh outdoor exposure.

Geological facts

Marble’s veins and color arise from impurities and deformation during metamorphism; calcite-rich varieties fizz when exposed to dilute acid.

Field identification & locations

The image appears to show a polished slab, but veining alone cannot distinguish marble from engineered or other natural stone. Field checks include a scratch test and a discreet dilute-acid test; common sources include Italy, Greece, Turkey, India, and the United States.