Rock Identifier
Shark Tooth Fossil (Selachii fossil) — fossil
fossil

Shark Tooth Fossil

Selachii fossil

AI-generated identification · may be incorrect

Hardness 5 on the Mohs scale, dark brown to black color, vitreous to dull luster, composed primarily of fluorapatite and calcium phosphate.

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Physical properties

Hardness 5 on the Mohs scale, dark brown to black color, vitreous to dull luster, composed primarily of fluorapatite and calcium phosphate.

Formation & geological history

Formed through the process of permineralization where organic tooth material is slowly replaced by minerals over millions of years, typically dating from the Cretaceous to Miocene epochs.

Uses & applications

Valued by fossil collectors, educational displays, and occasionally used in jewelry.

Geological facts

Sharks shed thousands of teeth during their lifetimes, making teeth the most common shark fossil found worldwide.

Field identification & locations

Found frequently in river beds, coastal exposures, and marine sedimentary formations; identifiable by its distinct triangular or pointed blade shape and glossy enameloid surface.

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