Rock Identifier
Likely limestone (Calcite-rich carbonate rock, principally calcium carbonate (CaCO₃)) — sedimentary
sedimentary

Likely limestone

Calcite-rich carbonate rock, principally calcium carbonate (CaCO₃)

AI-generated identification · may be incorrect

Pale gray-white, dull and fine-grained with an irregular fracture; calcite is Mohs hardness 3, rhombohedral, and fizzes in dilute acid. The image alone does not show enough detail to confirm the identification.

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Physical properties

Pale gray-white, dull and fine-grained with an irregular fracture; calcite is Mohs hardness 3, rhombohedral, and fizzes in dilute acid. The image alone does not show enough detail to confirm the identification.

Formation & geological history

Limestone forms by accumulation of marine carbonate shells or chemical precipitation, commonly in shallow seas; its age cannot be determined from the specimen’s appearance.

Uses & applications

Used for cement and lime manufacture, aggregate, building stone, and agricultural soil treatment.

Geological facts

Limestone can be distinguished from many look-alike pale rocks by a vigorous fizz when a fresh surface contacts dilute hydrochloric acid.

Field identification & locations

Common worldwide in sedimentary basins; check for shell fragments and acid reaction, while avoiding destructive tests on valuable specimens.

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