fossil

Fossil bone, possibly a large mammal long-bone fragment

Fossilized cortical bone; taxon indeterminate from the photograph

AI-generated identification · may be incorrect

Dense tan-brown mineralized bone with a rough weathered surface and an apparent longitudinal break or groove; original bone microstructure may be replaced by calcite, silica, or iron minerals. Hardness commonly about 3–6 Mohs, depending on mineralization; specific gravity typically ~2.2–2.8.

Identified August 14, 2026More fossil →

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At a glance

Common name: Fossil bone, possibly a large mammal long-bone fragment
Scientific name: Fossilized cortical bone; taxon indeterminate from the photograph
Category: fossil
Identified: August 14, 2026
Method: Standard

AI Estimated Value

About $10–$100 for an unidentified fragment; $100–$1,000+ for well-preserved, legally documented specimens with confident identification and 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

Formed when buried bone was progressively mineralized during diagenesis, often in sedimentary deposits. Exact age and species require microscopy, locality data, and preparation details.

Uses & applications

Primarily a collecting, educational, or paleontological specimen; not generally used industrially or as jewelry. Scientific value can be significant if its provenance and diagnostic anatomy are preserved.

Geological facts

The shape suggests a limb-bone shaft, but the image is insufficient to distinguish mammal, reptile, or other vertebrate bone. A fresh broken surface may reveal porous internal structure and mineral replacement.

Field identification & locations

Look for a fibrous/porous interior, cortical-versus-cancellous bone structure, mineral infill, and consistent weight; ordinary stone may mimic bone. Common settings include river gravels, deserts, caves, and sedimentary formations worldwide.