sedimentary

Light-colored limestone or marble fragment

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

AI-generated identification · may be incorrect

Cream-white, opaque, dull to slightly sugary luster, irregular granular texture, and no obvious crystals or cleavage visible. Calcite has Mohs hardness 3 and rhombohedral cleavage; specific gravity is about 2.7. Effervescence with dilute hydrochloric acid strongly supports calcite.

Identified September 3, 2026More sedimentary →

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At a glance

Common name: Light-colored limestone or marble fragment
Scientific name: Calcite-rich carbonate rock; likely limestone (CaCO₃), possibly recrystallized marble
Category: sedimentary
Identified: September 3, 2026
Method: Standard

AI Estimated Value

Typically $1-$10 for a common fragment; attractive fossiliferous or collectible marble/limestone specimens may range from $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

If limestone, it formed from deposited marine carbonate mud or shell material, commonly during the Paleozoic–Cenozoic; if marble, burial metamorphism recrystallized limestone. The photograph cannot determine its geological age or distinguish the two confidently.

Uses & applications

Limestone is used for cement, lime, aggregate, soil amendment, and building stone; marble is used for decorative stone and sculpture. This small rough fragment has little commercial value.

Geological facts

Calcite-rich rocks react readily with dilute acid, unlike quartz-rich rocks. A porcelain streak is white, but streak testing may damage the specimen.

Field identification & locations

Common in sedimentary basins and metamorphic belts worldwide. Test a fresh surface with vinegar or dilute hydrochloric acid, inspect for fossils or visible interlocking calcite grains, and avoid confusing it with pale quartzite, which is much harder and acid-inert.