Chemical and powder diffraction data are given for fossilized dental enamel from a mastodon tooth. The specific gravity is 2.968 (20°/4° C.) and a0=9.454, C0=6.892 Å.

Calculations, analogous to those previously made for francolite, indicate that the carbonate groups enter the structure as substitutions for phosphate groups. However, (CO3OH) does not appear to be an accurate representation. The recent supposition that carbonate groups can substitute for (F, OH) groups of normal apatite is untenable.

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