fossil

Fossilized bone fragment (probable mammalian tooth or bone)

Mineralized bone, commonly hydroxyapatite [Ca5(PO4)3(OH)] replaced or impregnated by silica/calcite

AI-generated identification · may be incorrect

Cream-yellow, layered and porous, with dark mineral staining; typically dull to waxy luster and no obvious crystal faces. Hardness is usually about 4–6 Mohs, depending on mineralization; specific gravity commonly 2.2–3.0.

Identified August 19, 2026More fossil →

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At a glance

Common name: Fossilized bone fragment (probable mammalian tooth or bone)
Scientific name: Mineralized bone, commonly hydroxyapatite [Ca5(PO4)3(OH)] replaced or impregnated by silica/calcite
Category: fossil
Identified: August 19, 2026
Method: Standard

AI Estimated Value

$5–$30 for an unattributed fragment; $50–$300+ if securely identified, well-preserved, and legally 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

Originally biological bone or tooth, later buried and mineralized as groundwater replaced or filled organic tissues over thousands to millions of years; exact age and identity require microscopy or locality data.

Uses & applications

Primarily a collecting, educational, and paleontological specimen; exceptional identifiable fossils may be prepared for display.

Geological facts

The visible layered, irregular structure is more consistent with fossil bone or tooth than an igneous, sedimentary, or metamorphic rock. Yellow coloration commonly results from iron-oxide staining or diagenetic minerals.

Field identification & locations

Look for porous internal texture, biological layering, and irregular cortical surfaces; a fresh fracture may reveal distinctive bone canals or tooth enamel/dentine. Common in sedimentary deposits, river gravels, caves, and deserts; avoid acid or aggressive cleaning.