sedimentary

Crushed limestone gravel

Limestone; predominantly calcite (CaCO₃), possibly dolomitic limestone with dolomite (CaMg(CO₃)₂)

AI-generated identification · may be incorrect

Pale gray to whitish, generally dull to subtly crystalline, with irregular fracture and occasional fossil or shell textures. Calcite has Mohs hardness 3, rhombohedral cleavage, and reacts vigorously with dilute hydrochloric acid; specific gravity is about 2.7.

Identified August 23, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from accumulated marine carbonate sediments that lithified into limestone, commonly during Paleozoic–Mesozoic seas; the photographed material has been mechanically crushed for aggregate.

Uses & applications

Widely used for road base, drainage, concrete aggregate, landscaping, railroad ballast, and cement or lime production; it is not typically jewelry-grade.

Geological facts

The angular fragments and mixed sizes indicate quarry-produced crushed stone rather than naturally rounded river gravel. White powder or fizzing under acid supports a limestone identification.

Field identification & locations

Common worldwide, especially in regions underlain by marine carbonate formations; test a fresh surface with dilute acid and check for visible fossils or calcite veins. Typical bulk value is about $20–$80 per ton, while small decorative bags may cost $5–$20.