fossil

Polished fossil shark tooth

Likely fossilized shark tooth, possibly Otodus obliquus or a related lamniform shark

AI-generated identification · may be incorrect

Dark gray-brown to black enameloid with lighter tan areas, glossy polished luster, and a triangular tooth form; Mohs hardness roughly 5–6. The apparent white support beneath it may be display material, not part of the fossil.

Identified September 14, 2026More fossil →

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Physical properties

Formation & geological history

Shark teeth mineralize through permineralization and phosphatization after burial in marine sediments, commonly during the Cretaceous–Miocene (about 145–5 million years ago). Exact age and species require locality and anatomical details.

Uses & applications

Used mainly for collecting, jewelry, and educational display; polished specimens have modest decorative value.

Geological facts

The dark coloration commonly results from mineral replacement by phosphate, iron, or manganese compounds. Shark teeth are abundant fossils because sharks continually replace their teeth.

Field identification & locations

Identify by enamel-like glossy surface, dense brown-black fossilized root, and tooth geometry; common sources include Morocco, Indonesia, the southeastern United States, and Peru. Value depends heavily on species, size, preservation, and verified provenance.