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Science 9 June 1967:
Vol. 156. no. 3780, pp. 1373 - 1375
DOI: 10.1126/science.156.3780.1373
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Articles

Lepidocrocite, an Apatite Mineral, and Magnetite in Teeth of Chitons (Polyplacophora)

H. A. Lowenstam 1

1 Division of Geological Sciences, California Institute of Technlogy, Pasadena 91109

X-ray diffraction patterns show that the mature denticles of three extant chiton species are composed of the mineral lepidocrocite and an apatite mineral, probably francolite, in addition to magnetite. Each of the three minerals forms a discrete microarchitectural unit of the chiton denticles. This is the first indication that lepidocrocite is precipitated by marine organisms and an apatite mineral by chitons.


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Transformation of Amorphous Calcium Phosphate to Crystalline Dahillite in the Radular Teeth of Chitons.
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Science. ISSN 0036-8075 (print), 1095-9203 (online)