fossil

Fossil bone fragment, likely vertebrate limb or rib bone

Fossilized bone (apatite-rich hydroxyapatite, Ca₅(PO₄)₃OH); exact taxon indeterminate

AI-generated identification · may be incorrect

Cream to tan, porous and irregular, with apparent cortical texture and internal cancellous structure; low luster. Fossil bone commonly has Mohs hardness about 5, but this specimen’s density and hardness are not diagnostic from an image.

Identified August 25, 2026More fossil →

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At a glance

Common name: Fossil bone fragment, likely vertebrate limb or rib bone
Scientific name: Fossilized bone (apatite-rich hydroxyapatite, Ca₅(PO₄)₃OH); exact taxon indeterminate
Category: fossil
Identified: August 25, 2026
Method: Standard

AI Estimated Value

About $5–$30 for an unidentified fragment; $50–$500+ if securely identified, well-preserved, legally collected, and accompanied by provenance.

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

Originally formed as vertebrate bone, then mineralized during burial as groundwater replaced or filled the organic tissue, commonly over thousands to millions of years. Geological age and locality cannot be established visually.

Uses & applications

Primarily a collecting and educational specimen; occasionally used for paleontological study. Value depends strongly on confirmed identification, provenance, completeness, and legal collecting status.

Geological facts

The visible layered/porous structure is more consistent with bone than ordinary limestone or a crystal. A dilute hydrochloric-acid reaction may occur if carbonate minerals infill the pores, but testing should be conservative.

Field identification & locations

Look for dense outer cortex surrounding porous trabecular interior, anatomical curvature, and repeated vascular channels; a specialist should confirm it because weathered limestone can resemble bone. Common in fossil-bearing river gravels, deserts, caves, and sedimentary formations worldwide.