Rock Identifier
Fossil Bone Fragment (Fossilized osteological material (Hydroxylapatite permineralized with secondary minerals)) — fossil
fossil

Fossil Bone Fragment

Fossilized osteological material (Hydroxylapatite permineralized with secondary minerals)

AI-generated identification · may be incorrect

Hardness 4-5 on the Mohs scale, earthy to dull luster, grayish-tan color, exhibiting a dense outer cortex and porous inner trabecular structure.

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Physical properties

Hardness 4-5 on the Mohs scale, earthy to dull luster, grayish-tan color, exhibiting a dense outer cortex and porous inner trabecular structure.

Formation & geological history

Formed via permineralization where groundwater minerals deposit into the porous cellular spaces of buried skeletal remains over thousands to millions of years.

Uses & applications

Valued primarily for paleontological study, educational reference collections, and amateur fossil collecting.

Geological facts

Fossil bones readily stick to the tongue due to their microscopic porous structures absorbing moisture, a common field test used by paleontologists.

Field identification & locations

Identified by the distinct honeycombed cancellous bone visible at fractures; typically found in sedimentary formations, river gravels, and badlands.

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Crinoid Stem Fossil in Matrix

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Fossiliferous limestone (likely a crinoidal or shell-fragment limestone) (Bioclastic limestone, composed chiefly of calcite (CaCO₃)) — sedimentary

Fossiliferous limestone (likely a crinoidal or shell-fragment limestone)

Bioclastic limestone, composed chiefly of calcite (CaCO₃)

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Fossil oyster shell (Oyster (family Ostreidae); shell composed chiefly of calcite (CaCO₃)) — fossil

Fossil oyster shell

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Weathered fossil bone fragment (identification uncertain)

Fossilized bone; exact taxon and mineral composition cannot be determined from the image

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