Transformation of Amorphous Calcium Phosphate to Crystalline Dahillite in the Radular Teeth of Chitons

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Science  04 Jan 1985:
Vol. 227, Issue 4682, pp. 51-53
DOI: 10.1126/science.227.4682.51


A comparison of infrared spectra from individual teeth along the radula of a chiton (Polyplacophora, Mollusca) shows that the first-formed calcium phosphate mineral is amorphous. Over a period of weeks the mineral transforms to dahllite. The c axes of the dahllite crystals are aligned approximately perpendicular to the tooth surface.