Synthetic and natural chlorine-bearing apatite |
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| Authors: | Tom K Ekström |
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| Institution: | (1) Division of Mineralogy and Petrology, Institute of Geology, Uppsala, Sweden |
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| Abstract: | Hydrothermal syntheses of chlor-hydroxyapatite have been carried out between 300 and 700° C at a constant pressure of 1000
bar. The substitution of OH for Cl varies as a function of the amount of added CaCl2, temperature, and pH. In the main reaction the incorporation of Cl is negligible at 300° C but increases to over 40 mole
percent Cl-apatite at 700° C. A simple X-ray method for determining the Cl/Cl+OH ratio has been developed and this is also
extended to fluorine-bearing chlor-hydroxyapatites. A number of natural chlor-fluorhydroxyapatites are discussed in the light
of the X-ray method and the result of the synthesis. |
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