The radula of Patella limpets has cutting tips that incorporate magnetite crystals and silicon dioxide.

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References

"Another mollusk, the limpet Patella, backs the magnetite cutting tips of its radula with silicon dioxide (Runham et al. 1969). Incidentally, mollusks renew their radulas from the back as they wear near the front much the way elephants renew their teeth." (Vogel 2003:333)

"Most classes in the phylum of the Mollusca possess a radula, a flexible ribbon, located in the mouth cavity, on which are implanted several tens of transverse rows of teeth. The radula is used as a rasp during feeding of organisms living on rocky substrates. Through the continuous growth of the radular ribbon new rows of teeth steadily enter into the wearing zone, while at the same rate teeth in the last row break loose from the ribbon. The enhanced erosive capability of the radula is due to the presence of teeth with an upright standing, hard, mineralized cusp." (van der Wal et al. 2000)

Book
Comparative Biomechanics: Life's Physical World, Second EditionJune 17, 2013
Steven Vogel

Journal article
The mineralization and hardness of the radular teeth of the limpet Patella vulgata L.Z. Zellforsch.November 6, 2004
N. W. Runham, P. R. Thornton, D. A. Shaw, R. C. Wayte

Journal article
Radular teeth as models for the improvement of industrial cutting devicesMaterials Science and Engineering: CJuly 25, 2002
Paul van der Wal, Huub J Giesen, John J Videler

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Organism
Common European LimpetPatella vulgataSpecies


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