Journal
AMERICAN MINERALOGIST
Volume 94, Issue 4, Pages 507-516Publisher
MINERALOGICAL SOC AMER
DOI: 10.2138/am.2009.3095
Keywords
Apatite-(CaF); IR spectroscopy; NMR spectroscopy
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We have studied the Substitutions in a natural well-crystallized carbonate-containing apatite-(CaF) (var. staffelite) using infrared (IR) and solid-state nuclear magnetic resonance (NMR) spectroscopic techniques. Our results show the presence of both A- and B-type carbonate plus a large amount of structural water (0.44 pfu). This sample also contains 0.21 pfu excess F, but only weak C-F dipolar coupling is observed indicating that a tetrahedral CO3F3- complex does not occur. F-19 NMR results indicate the presence of a second F environment in the apatite structure at a concentration similar to that of B-type carbonate but which does not differ from channel F in terms of coupling to P-31 or H-1.
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