metamorphic

Veined marble or calcitic limestone

Calcite-dominant carbonate rock (CaCO₃), likely marble

AI-generated identification · may be incorrect

Gray, fine- to medium-grained, with prominent white calcite veins and weak foliation/banding; vitreous to pearly cleavage surfaces. Calcite has Mohs hardness 3, rhombohedral cleavage, and reacts vigorously with dilute hydrochloric acid; specific gravity about 2.7.

Identified September 2, 2026More metamorphic →

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Physical properties

Formation & geological history

Likely limestone recrystallized during low- to medium-grade regional or contact metamorphism, with later fractures filled by calcite. Exact geological age cannot be determined from the photograph and depends on its source locality.

Uses & applications

Used as decorative and architectural stone, aggregate, tile, and occasionally as a teaching or collector specimen; attractive polished pieces may be used ornamentally.

Geological facts

The white networks are likely secondary calcite veins rather than original layering. A steel knife can scratch calcite, while quartz cannot be scratched by one.

Field identification & locations

Common in metamorphic belts and carbonate regions worldwide, including Italy, Greece, Turkey, the United States, and Canada. Confirm by acid effervescence and hardness testing; if it does not fizz, it may instead be a quartz-rich or silicate rock.