metamorphic

Gray-white marble

Calcite marble (recrystallized limestone; primarily CaCO₃)

AI-generated identification · may be incorrect

Typically Mohs hardness 3, white to gray with smoky veining, vitreous to pearly luster, and interlocking calcite crystals; weak rhombohedral cleavage. The image appears to show a polished architectural slab.

Identified September 13, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when limestone undergoes heat and pressure, recrystallizing calcite; ages vary with the source deposit, commonly Paleozoic to Mesozoic. Gray veining may consist of graphite, quartz, mica, or other impurities.

Uses & applications

Used for countertops, flooring, wall cladding, sculpture, monuments, and decorative stone; generally not a gemstone, though attractive specimens are collectible.

Geological facts

Marble reacts vigorously with dilute hydrochloric acid or vinegar, producing bubbles, unlike most silicate rocks. Its veining and translucency make each slab distinctive.

Field identification & locations

Identify by its calcite-rich composition, acid effervescence, softness, and crystalline texture; common sources include Italy, Greece, Turkey, India, and the United States. The image alone cannot determine a precise quarry or variety.