fossil

Shark Tooth Fossil

Chondrichthyes fossil

Hardness varies (typically Mohs 5-7 depending on mineralization), dark brown to black color with possible lighter root or matrix areas, vitreous to dull luster, composed of fluorapatite and dentin replacement minerals, specific gravity around 2.7-3.0.

Identified July 30, 2026More fossil →

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Physical properties

Formation & geological history

Formed through the process of permineralization where shark teeth, which are naturally shed in the thousands over a lifetime, are rapidly buried in sediment (marine or riverine environments) and their porous structure is slowly replaced by minerals over millions of years.

Uses & applications

Valuable for paleontological study, educational displays, jewelry, and fossil collecting.

Geological facts

Sharks can shed tens of thousands of teeth in their lifetime, making teeth the most common part of the shark to survive in the fossil record. Fossilized teeth often turn black because they absorb minerals like iron and phosphate from the surrounding sediment over millennia.

Field identification & locations

Can be identified in the field by its distinct triangular shape, smooth or serrated cutting edges, and characteristic thickness toward the root. Commonly found in riverbeds, coastal erosion zones, and sedimentary formations globally, such as the Calvert Cliffs in Maryland or Peace River in Florida.