sedimentary

Calcite-rich limestone

Limestone, predominantly calcite (CaCO₃), possibly recrystallized

AI-generated identification · may be incorrect

Cream to peach, fine-grained and massive with a dull to slightly pearly luster; Mohs hardness 3, weak cleavage, and specific gravity about 2.6–2.8. Calcite-rich material effervesces strongly with dilute hydrochloric acid or vinegar, though the surface appears weathered.

Identified August 15, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from accumulated marine carbonate mud, shells, or precipitated calcium carbonate; its exact geological age cannot be determined from the photograph. Burial and mild recrystallization may have produced the blocky texture.

Uses & applications

Used for cement, lime, aggregate, building stone, and soil conditioning; attractive pieces may be sold as cabinet specimens, though this example appears common and unfinished.

Geological facts

Limestone is one of Earth’s most widespread sedimentary rocks and commonly records ancient shallow-sea environments. Pink or peach tones can result from iron oxides or other trace impurities.

Field identification & locations

Look for a soft, pale carbonate rock that scratches easily with a steel knife and fizzes in acid; common worldwide, especially in former marine basins. Distinguishing it from marble requires texture and acid testing, since both are calcitic.