fossil

Fossilized bone fragment

Mineralized vertebrate bone, likely mammalian; exact taxon indeterminate

AI-generated identification · may be incorrect

Porous, trabecular texture with layered cortical structure; cream to gray-brown color and dull earthy luster. Original bone apatite is commonly replaced or impregnated by calcite, silica, or iron minerals; hardness typically about 3–6 depending on mineralization.

Identified August 29, 2026More fossil →

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Physical properties

Formation & geological history

A bone was buried in sediment and progressively mineralized during diagenesis, generally over thousands to millions of years. The visible cellular pores and dense outer cortex support a bone interpretation rather than ordinary limestone.

Uses & applications

Used primarily for education, paleontology, and collecting; not generally suitable for jewelry or construction. Scientific value depends on identifiable anatomy and locality documentation.

Geological facts

Fossil bone often preserves Haversian canals and cancellous (spongy) interior architecture. A fresh broken surface, UV response, acid reaction, and microscopic examination can help distinguish it from porous limestone.

Field identification & locations

Common in sedimentary exposures, river gravels, deserts, and fossil beds worldwide; notable sources include the western United States, Morocco, and Mongolia. This specimen lacks enough diagnostic anatomy for species identification.