fossil

Polished fossiliferous limestone, possibly coral or shell fossil

Calcite-rich limestone (CaCO₃), with probable fossilized skeletal structures

AI-generated identification · may be incorrect

Tan-orange, fine-grained, matte to weakly waxy surface with pale branching/curved patterns; likely Mohs hardness 3, nonmetallic luster, and no visible crystal cleavage in the polished piece. It should effervesce with dilute hydrochloric acid or vinegar if calcitic.

Identified September 12, 2026More fossil →

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At a glance

Common name: Polished fossiliferous limestone, possibly coral or shell fossil
Scientific name: Calcite-rich limestone (CaCO₃), with probable fossilized skeletal structures
Category: fossil
Identified: September 12, 2026
Method: Standard

AI Estimated Value

Approximately $5–$25 for a common polished specimen; $30–$100+ if the fossil structure is distinctive, large, or well documented.

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

A sedimentary carbonate rock formed from accumulated marine shells, coral, or lime mud, later lithified and polished; its exact geological age cannot be determined from the image. Such material commonly ranges from Paleozoic to Cenozoic in age.

Uses & applications

Used as a decorative polished specimen, fossil collectible, cabochon, or educational sample; similar limestone is also used for aggregate, cement, and building stone.

Geological facts

The internal pale patterns may represent fossil coral, shell fragments, or calcite-filled fractures, but the photograph is insufficient for precise fossil identification.

Field identification & locations

Common in limestone-bearing marine formations worldwide, especially Florida, the Caribbean, Europe, and parts of Asia. Look for carbonate fizz, visible fossil chambers or cellular coral texture, and softness relative to quartz.