Rock Identifier
Likely calcite-rich limestone (Calcite (CaCO₃), probably micritic or fossiliferous limestone) — sedimentary
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 More sedimentary
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Physical properties

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.

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.