Rock Identifier
Fossilized tooth, likely shark tooth (Fossilized selachian tooth; possibly a worn Otodus or related shark tooth) — fossil
fossil

Fossilized tooth, likely shark tooth

Fossilized selachian tooth; possibly a worn Otodus or related shark tooth

AI-generated identification · may be incorrect

Dark gray-brown, glossy enamel-like outer coating with a tan mineralized interior; the specimen is strongly worn and broken, obscuring the crown and root. Fossil teeth are mainly apatite (Mohs ~5) with enamel-like enameloid, commonly showing layered or ridged structure.

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Physical properties

Dark gray-brown, glossy enamel-like outer coating with a tan mineralized interior; the specimen is strongly worn and broken, obscuring the crown and root. Fossil teeth are mainly apatite (Mohs ~5) with enamel-like enameloid, commonly showing layered or ridged structure.

Formation & geological history

Formed from a shark tooth buried in marine sediment, with original organic material replaced or stabilized by minerals during diagenesis. The exact geological age cannot be determined from the image, but comparable specimens range from Cretaceous to Neogene deposits.

Uses & applications

Primarily a collectible and educational fossil; polished or attractive examples are used in jewelry and display. Scientific value depends on identifiable morphology and locality documentation.

Geological facts

The visible banded gray material may represent mineralized root or internal tooth structure rather than ordinary rock. Shark teeth are commonly preserved because their phosphate-rich composition resists dissolution.

Field identification & locations

Look for enamel/enameloid, a distinct root, bilateral symmetry, and cutting edges; test cautiously because hardness and appearance vary with mineralization. Common sources include marine sediments in North America, Morocco, Indonesia, and Australia.

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Bioclastic limestone, composed chiefly of calcite (CaCO₃)

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