fossil

Shark Tooth Fossil

Chondrichthyes fossil

AI-generated identification · may be incorrect

Hardness 5 on Mohs scale due to mineral replacement, usually black, brown, or grey, vitreous to dull luster, triangular or curved shape.

Identified October 19, 2026More fossil →

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Physical properties

Hardness 5 on Mohs scale due to mineral replacement, usually black, brown, or grey, vitreous to dull luster, triangular or curved shape.

Formation & geological history

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

Uses & applications

Collected by enthusiasts, used in jewelry, and valuable for paleontological research.

Geological facts

Sharks lose thousands of teeth in a lifetime, making their teeth some of the most common vertebrate fossils found worldwide.

Field identification & locations

Found frequently in riverbeds, coastal cliffs, and ancient marine deposits; identified by its distinctive enameloid blade and serrated edges.

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Probable fossil-bearing rock or mineral concretion

Unidentified carbonate-rich concretion with a possible fossil inclusion

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Likely fossil oyster shell

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

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Crinoid Stem Fossil in Matrix

Phylum Echinodermata, Class Crinoidea

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

Bioclastic limestone, composed chiefly of calcite (CaCO₃)

sedimentary

Porous limestone pebble

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

sedimentary

Fossil oyster shell

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

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