fossil

Shark Tooth Fossil

Fossilized Chondrichthyes Tooth

Hardness 5 on Mohs scale; dark brown, black, or gray coloration; vitreous to dull luster; composed mostly of fluorapatite.

Identified October 24, 2026More fossil →

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Physical properties

Hardness 5 on Mohs scale; dark brown, black, or gray coloration; vitreous to dull luster; composed mostly of fluorapatite.

Formed through permineralization where groundwater minerals replace the original organic material of buried teeth over millions of years.

Collected as educational specimens, used in jewelry, and studied to understand ancient marine ecosystems.

Sharks shed thousands of teeth during their lifetimes, making fossilized shark teeth relatively common discoveries in sedimentary deposits.

Identify by triangular shape, smooth enamel, and distinct root structure; commonly found in riverbeds, coastal cliffs, and phosphate mines.

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