fossil

Fossilized Shark Tooth

Chondrichthyes teeth

Mohs hardness around 5; colors range from gray, brown, to black; vitreous to dull luster; composed mostly of apatite and enameloid.

Identified October 23, 2026More fossil →

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Physical properties

Mohs hardness around 5; colors range from gray, brown, to black; vitreous to dull luster; composed mostly of apatite and enameloid.

Formed through the permineralization of discarded shark teeth buried in marine sediment over millions of years.

Used primarily in paleontology research, lapidary art, jewelry making, and fossil collecting.

Sharks shed thousands of teeth during their lifetime, making their teeth one of the most common vertebrate fossils found worldwide.

Found frequently in marine sedimentary deposits, river gravels, and coastal cliffs by screening sediment or visual searching.

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)