Rock Identifier
Fossilized Shark Tooth (Chondrichthyes (Class)) — fossil
fossil

Fossilized Shark Tooth

Chondrichthyes (Class)

AI-generated identification · may be incorrect

Hardness: 5-5.5 (Mohs scale due to mineral replacement); Color: Typically tan, brown, grey, or black; Luster: Vitreous to dull; Crystal structure: Microcrystalline apatite/phosphates; Specific gravity: 2.7-3.0

Hardness
5-5
Color
Typically tan, brown, grey, or black
Luster
Vitreous to dull
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Physical properties

Hardness: 5-5.5 (Mohs scale due to mineral replacement); Color: Typically tan, brown, grey, or black; Luster: Vitreous to dull; Crystal structure: Microcrystalline apatite/phosphates; Specific gravity: 2.7-3.0

Formation & geological history

Formed through the process of permineralization or fossilization, where original organic material in shark teeth is gradually replaced by minerals like silica, calcium carbonate, or phosphate over millions of years, often dating from the Cretaceous to Cenozoic eras.

Uses & applications

Prized by fossil collectors, used in educational displays, and crafted into jewelry.

Geological facts

Sharks lose thousands of teeth in a lifetime, making teeth the most common shark fossil found worldwide. Some ancient species like Megalodon produced teeth over 7 inches long.

Field identification & locations

Found frequently in riverbeds, coastal cliffs, and ancient marine deposits. Collectors often screen sift gravel beds or search beach lines where fossiliferous layers erode.

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