fossil

Fossilized bone fragment

Permineralized vertebrate bone, likely mammalian or reptilian; exact identification requires microscopy

AI-generated identification · may be incorrect

Cream-tan, dense and granular with a porous cortical surface and layered/irregular internal structure. Likely hardness about 3–5 Mohs; dull to slightly waxy luster, with no obvious cleavage; specific gravity commonly 2.0–3.0 after fossilization.

Identified August 30, 2026More fossil →

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Physical properties

Formation & geological history

Mineral-rich groundwater replaced or infilled bone pores during burial and diagenesis, preserving its cellular structure; age cannot be determined from the photograph and may range from Cenozoic to older.

Uses & applications

Primarily a teaching or collecting specimen; polished fossil bone can be decorative, but it has little industrial or jewelry use.

Geological facts

The visible texture resembles remodeled bone cortex and possible internal cavities rather than ordinary limestone, though concretions and weathered rock can look similar.

Field identification & locations

Look for tiny vascular canals, a spongy interior, and consistent bone-like curvature; a close-up, locality, acid test, and thin section would improve identification. Fossil bone commonly occurs in river gravels, badlands, caves, and sedimentary formations worldwide.