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Figure 15
A comparison of apatite unit-cell parameter determinations for the shark tooth and brachiopod fossils (this work) and derived from the ICDD database. The points labelled hy­droxy­lapatite, fluorapatite and chlorapatite [Ca5(PO4)3Cl] are for minerals listed as pure whereas the mixed apatites have the general formula [Ca5(PO4)3(OH,F,Cl)], though they may have a composition close to one of the end-members of the solid solution. Carbonate apatites have the general formula [Ca5(PO4,CO3)3(OH,F,Cl)], but the carbonate content may be very low. Carbonate-containing apatites with relatively high carbonate content tend to have the lowest a unit-cell dimension for the structures in the ICDD database.

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ISSN: 2053-2733
Volume 73| Part 4| July 2017| Pages 293-311
https://doi.org/10.1107/S2053273317008592
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