fossil

Fossil bone fragment (likely vertebrate bone)

Fossilized vertebrate bone; exact taxon indeterminate from the photograph

AI-generated identification · may be incorrect

Dense, irregular fragment with a weathered pale gray-tan surface and possible porous/cancellous texture. Fossil bone commonly has Mohs hardness about 3–5, dull to earthy luster, and no consistent cleavage; mineral replacement may increase hardness.

Identified August 26, 2026More fossil →

Explore Fossil bone fragment (likely vertebrate bone) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

At a glance

Common name: Fossil bone fragment (likely vertebrate bone)
Scientific name: Fossilized vertebrate bone; exact taxon indeterminate from the photograph
Category: fossil
Identified: August 26, 2026
Method: Standard

AI Estimated Value

About $5–$50 for an unattributed fragment; $50–$500+ if clearly identified, well-preserved, legally collected, and accompanied by locality documentation.

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 biological bone, then buried and permineralized by groundwater carrying silica, calcite, or iron minerals. Its geological age and depositional environment cannot be determined from the image alone.

Uses & applications

Primarily a collecting, educational, and paleontological specimen; occasionally used decoratively. Scientific value depends on locality, diagnostic anatomy, and legal provenance.

Geological facts

The apparent internal texture and curved cortical surface are more consistent with bone than an ordinary rock, but a close examination is needed to distinguish it from weathered limestone or a mineral cast.

Field identification & locations

Look for a natural outer cortex, porous interior, and cellular structure; a fresh broken surface may reveal vascular canals. Common fossil-bone localities include sedimentary basins worldwide, especially river, lake, and floodplain deposits.