sedimentary

Likely calcite-rich limestone

Calcite (CaCO₃), probably micritic or fossiliferous limestone

AI-generated identification · may be incorrect

Cream to tan, rough and earthy with dull to pearly luster; Mohs hardness 3, white streak, irregular fracture, and no obvious cleavage visible. Calcite should effervesce vigorously in dilute hydrochloric acid or vinegar, though vinegar may react slowly.

Identified September 22, 2026More sedimentary →

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Physical properties

Formation & geological history

Limestone forms from accumulated marine carbonate mud, shells, or chemical precipitation, commonly during Paleozoic–Cenozoic marine deposition; the exact age cannot be determined from the image.

Uses & applications

Used for cement, aggregate, lime, dimension stone, and soil neutralization; attractive pieces may be collected, but this specimen has little gem value.

Geological facts

The apparent pale, granular texture is consistent with calcite-rich carbonate rock, though dolostone or weathered marble are possible alternatives without testing.

Field identification & locations

Common in sedimentary basins worldwide, especially marine regions. Confirm by acid reaction, relatively low hardness, and possible scratching with a steel knife; dolomite reacts weakly unless powdered.