sedimentary

Likely limestone fragment

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

AI-generated identification · may be incorrect

Small, rough, cream-to-tan fragment with a pale, earthy surface; likely Mohs hardness 3 and nonmetallic, dull luster. The image does not show enough detail to confirm its texture or composition.

Identified October 9, 2026More sedimentary →

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Physical properties

Small, rough, cream-to-tan fragment with a pale, earthy surface; likely Mohs hardness 3 and nonmetallic, dull luster. The image does not show enough detail to confirm its texture or composition.

Formation & geological history

Limestone forms as carbonate sediment, often from shells and other marine material, then lithifies; its age and exact formation environment cannot be determined from the fragment alone.

Uses & applications

Limestone is widely used for cement and aggregate, and as building stone and agricultural lime; this small piece has little practical or collector value.

Geological facts

Calcite-rich limestone typically fizzes when a drop of dilute acid is applied, though weathering or impurities can weaken the reaction.

Field identification & locations

A carbonate rock is often pale and may contain visible fossils or grains; confirm by testing a fresh surface with dilute acid and checking that it scratches more easily than glass. Limestone occurs worldwide in sedimentary basins.