fossil

Fossil Shark Tooth

Chondrichthyes (tooth)

Hardness varies from 3 to 5 on the Mohs scale depending on mineralization, typically brown to black in color, with a vitreous to dull luster.

Identified October 23, 2026More fossil →

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Physical properties

Hardness varies from 3 to 5 on the Mohs scale depending on mineralization, typically brown to black in color, with a vitreous to dull luster.

Formed through the process of permineralization where original tooth material is replaced by minerals like silica or apatite over millions of years.

Used primarily in fossil collecting, educational displays, and as pendants or gemstones in jewelry.

Shark teeth are shed continuously throughout a shark's lifetime, resulting in an abundance of teeth in the fossil record.

Found frequently in marine sedimentary deposits, riverbeds, and coastal erosion zones by beachcombers and fossil hunters.

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

Weathered fossil bone fragment (identification uncertain)

Fossilized bone; exact taxon and mineral composition cannot be determined from the image