sedimentary

Likely calcite-bearing limestone

Calcite (CaCO₃), probably in a porous limestone fragment

AI-generated identification · may be incorrect

White to cream, dull-to-vitreous luster, irregular granular texture, and possible pore spaces; calcite hardness 3, rhombohedral cleavage, and specific gravity about 2.7. Exact identification is limited by the small, low-detail image.

Identified September 3, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely formed from accumulated carbonate shells or chemically precipitated calcium carbonate, later lithified into limestone; age cannot be determined visually. It may also be a fragment of travertine or another carbonate deposit.

Uses & applications

Limestone is used for aggregate, cement, lime, soil treatment, and building stone; attractive calcite specimens may be collected, though this piece appears ordinary.

Geological facts

Calcite strongly effervesces with dilute hydrochloric acid or vinegar if freshly scratched, unlike most quartz-rich rocks. Its white color and porous appearance are consistent with carbonate material.

Field identification & locations

Common in limestone regions worldwide, including caves, marine sedimentary basins, and hot-spring deposits. Confirm with an acid test, Mohs scratch test, and examination for shell fragments or visible calcite cleavage.