fossil

Shark Tooth Fossil

Chondrichthyes fossilized tooth

Mohs hardness around 5; colors range from black, brown, to grey; vitreous to dull luster; composed primarily of fluorapatite.

Identified October 17, 2026More fossil →

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Physical properties

Mohs hardness around 5; colors range from black, brown, to grey; vitreous to dull luster; composed primarily of fluorapatite.

Formed through the process of permineralization where minerals slowly replace original biological material over millions of years.

Valued primarily by fossil collectors, used in educational displays, and crafted into jewelry.

Shark teeth are shed by the thousands over a shark's lifetime, making them one of the most common marine fossils found.

Found worldwide in sedimentary rock layers, especially riverbeds, coastal cliffs, and ancient marine deposits.

Probable fossil-bearing rock or mineral concretion

Unidentified carbonate-rich concretion with a possible fossil inclusion

Likely fossil oyster shell

Fossilized bivalve shell; exact species cannot be identified from the image

Crinoid Stem Fossil in Matrix

Phylum Echinodermata, Class Crinoidea

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

Bioclastic limestone, composed chiefly of calcite (CaCO₃)

Porous limestone pebble

Calcite-rich limestone (primarily CaCO₃); exact identification is uncertain from the image

Fossil oyster shell

Oyster (family Ostreidae); shell composed chiefly of calcite (CaCO₃)