sedimentary
Fossil Shark Tooth (Sand Tiger or Mackerel Shark)
Carcharias sp. or Otodus sp. replaced by Hydroxylapatite/Calcium Carbonate
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
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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.
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