sedimentary

Likely weathered limestone or marble fragment

Calcite-rich carbonate rock; likely limestone (CaCO₃), possibly recrystallized marble

AI-generated identification · may be incorrect

Pale cream-gray, fine- to medium-grained, dull to weakly sparkling surface with dark mineral/organic inclusions and irregular fracture. Calcite has Mohs hardness 3, rhombohedral cleavage, and specific gravity about 2.7; it should effervesce vigorously with dilute hydrochloric acid or vinegar if sufficiently fresh.

Identified September 17, 2026More sedimentary →

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At a glance

Common name: Likely weathered limestone or marble fragment
Scientific name: Calcite-rich carbonate rock; likely limestone (CaCO₃), possibly recrystallized marble
Category: sedimentary
Identified: September 17, 2026
Method: Standard

AI Estimated Value

Typically $0–$10 as an unprovenance fragment; attractive polished or fossiliferous specimens may sell for roughly $10–$50.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Limestone forms from accumulated carbonate mud, shells, or chemical precipitation, commonly during Paleozoic–Mesozoic marine deposition; marble forms when limestone is recrystallized by heat and pressure. The photograph alone cannot determine its exact age or whether it is marble.

Uses & applications

Common limestone is used for aggregate, cement, lime, building stone, and neutralizing acidic soils; marble is used decoratively and architecturally. This small irregular fragment has little commercial value.

Geological facts

The dark patches may be iron oxides, clay, graphite, or other inclusions rather than fossils. A polished surface and acid test would substantially improve identification.

Field identification & locations

Common in sedimentary terrains, quarries, road cuts, and metamorphic belts worldwide. Check for visible fossil fragments, crystalline texture, and acid reaction; avoid relying on color alone.