sedimentary

Polished fossiliferous stone egg, likely fossiliferous limestone or marble

Unidentified carbonate rock; likely calcite-rich limestone (CaCO₃), possibly fossil-bearing

AI-generated identification · may be incorrect

Polished oval carving, brown-gray with pale mottling and dark intersecting veins or fossil traces; calcite is Mohs 3, vitreous to dull, with rhombohedral cleavage. The image alone does not establish exact composition or crystal texture.

Identified October 3, 2026More sedimentary →

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At a glance

Common name: Polished fossiliferous stone egg, likely fossiliferous limestone or marble
Scientific name: Unidentified carbonate rock; likely calcite-rich limestone (CaCO₃), possibly fossil-bearing
Category: sedimentary
Identified: October 3, 2026
Method: Standard

AI Estimated Value

Approximately $10–$50 for a small polished stone carving; material and provenance could change the value.

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 marine carbonate sediments and was later lithified; marble would instead be recrystallized limestone. The egg shape is human-carved and polished, so its geological age and origin cannot be determined from the photo.

Uses & applications

Decorative carving and collectible; carbonate stone is also widely used for building stone, aggregate, and cement feedstock.

Geological facts

The crosshatched markings may be fossil or mineral veining, but are not diagnostic at this image resolution.

Field identification & locations

Look for fizzing with dilute acid and a scratch test: calcite-rich stone scratches readily and effervesces; verify suspected fossils under magnification. Carbonate rocks occur worldwide, especially in ancient marine strata.