sedimentary

Fossil Shark Tooth (Sand Tiger or Mackerel Shark)

Carcharias sp. or Otodus sp. replaced by Hydroxylapatite/Calcium Carbonate

AI-generated identification · may be incorrect

Hardness: 5 (Mohs); Color: Cream, tan, or white; Luster: Vitreous/enamel-like; Structure: Non-crystalline organic fossil; Cleavage: None (conchoidal fracture)

Hardness: 5 (Mohs)
Color: Cream, tan, or white
Luster: Vitreous/enamel-like

Identified February 14, 2026More sedimentary →

Explore Fossil Shark Tooth (Sand Tiger or Mackerel Shark) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 5 (Mohs); Color: Cream, tan, or white; Luster: Vitreous/enamel-like; Structure: Non-crystalline organic fossil; Cleavage: None (conchoidal fracture)

Formation & geological history

Formed through permineralization in marine sedimentary environments where organic tissue is replaced by minerals over millions of years. Most common specimens range from the Cretaceous to the Neogene (approx. 100 to 5 million years old).

Uses & applications

Primarily used as biological/evolutionary education specimens, decorative jewelry (pendants), and as a popular entry-level collectible for fossil hunters.

Geological facts

Sharks can produce and lose tens of thousands of teeth in their lifetime, which explains why they are one of the most abundant fossil types found worldwide. Unlike bone, shark teeth are often found in perfect condition because of their high mineral content.

Field identification & locations

Identify by the smooth, sharp enameloid crown and the V-shaped root structure (though roots are often broken, as seen here). Look in riverbeds, phosphate mines, or coastal areas with eroding cliffs. Collectors should check for serrations or 'cusplets' (small side spikes) to determine exact species.