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100% because very limited sample sizes precluded determination of carbon dioxide, moisture, and ignition loss.X-ray diffraction patterns of each sample revealed a poorly-crystalline apatite-like phase representing hydroxyapatite, Caio(OH)2(PO,)G, a major component of calculus"-D. Considerable quartz was also present, together with some calcium silicate, Ca3Si201, or calcium aluminium silicate, CaAhSi,Q". The similarity of the compositions indicates that the teeth were in contact for long periods with ground water from which silica precipitated within the relatively porous calculus structure. Table 2 Major and minor elemental analysis of dental deposits Element

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