sedimentary

Weathered calcite-rich limestone fragment

Limestone, predominantly calcite (CaCO₃), possibly bioclastic

AI-generated identification · may be incorrect

Pale cream, irregular and granular with dull-to-slightly pearly luster; likely Mohs hardness 3, low cleavage visibility, and specific gravity about 2.7. The porous, crumbly texture suggests weathered carbonate rock rather than a crystal specimen.

Identified September 20, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed by accumulation and lithification of marine carbonate sediment or shell material, commonly during the Paleozoic–Cenozoic; exact age cannot be determined visually. Surface weathering and dissolution produced its rough, pale appearance.

Uses & applications

Used for aggregate, cement, lime, building stone, and soil conditioning; attractive pieces may be collected but this fragment has negligible gem value.

Geological facts

Calcite effervesces vigorously with dilute hydrochloric acid or household vinegar, though vinegar reacts more slowly. Its irregular texture may indicate fossil-rich or shell-derived limestone.

Field identification & locations

Common worldwide, especially in former marine basins and karst regions. Confirm by testing a fresh surface with acid and checking that it scratches easily with a steel knife; visual identification is tentative because the image is low-resolution.