fossil

Fossilized bone fragment

Petrified bone, mineral-replaced vertebrate bone; exact taxon indeterminate

AI-generated identification · may be incorrect

Tan to brown, porous specimen with elongated internal striations and a dense outer cortex; likely hardness about 5–7 Mohs, dull to slightly vitreous luster, and no obvious cleavage. The visible vascular/cancellous texture supports bone rather than ordinary rock.

Identified August 28, 2026More fossil →

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Physical properties

Formation & geological history

Originally vertebrate bone later buried and permineralized as groundwater deposited silica, calcite, or iron oxides in its pores; age cannot be determined from the photograph and may range from Paleozoic to Cenozoic.

Uses & applications

Primarily a collecting, educational, and decorative specimen; polished petrified bone is sometimes used in cabochons and small carvings, but it has little industrial use.

Geological facts

Fossil bone commonly preserves a porous honeycomb or vascular pattern, often enhanced by brown, red, or black mineral staining. It is distinct from ordinary petrified wood, which typically shows wood grain and growth rings.

Field identification & locations

Inspect for a porous cortical/interior structure, mineral-filled channels, and consistent replacement rather than fresh organic tissue; common sources include western North America, Madagascar, and Australia. Exact identification requires locality and possibly microscopy.