Physics
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.2323s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 54, Issue 8, pp.2323-2328
Physics
2
Scientific paper
The physical and chemical effects of variable carbonate-ion substitution in francolite (carbonate fluorapatite) are of considerable geochemical interest. A new empirical equation defines the relation between CO 3 2- content and 2 for the (004) and (410) X-ray diffraction (XRD) reflections of francolite. The equation is based on analyses of 37 synthetic samples with a compositional range of 0.0-9.0 wt% CO 3 2- . Reported concentrations of CO 3 2- in the synthetic francolites are accurate to within ±0.30 wt% CO 3 2- , and the standard deviation of the reported values with respect to the empirical equation is ±0.49 wt% CO 3 2- . In contrast, the standard chemical procedure for determining the CO 3 2- content of natural francolite may produce absolute errors of 1-3 wt% CO 3 2- , especially for samples associated with small amounts of dolomite. Within these constraints, data from a variety of natural samples agree closely with the new empirical relation and imply that the new equation can be used to calculate the CO 3 2- content of natural francolites to within ±0.61 wt%, provided that 2 for the (004) and (410) pair of XRD reflections is measured to within ±0.005°2 .
Emanuele G.
Jahnke Richard A.
Kastner Michael
Schuffert J. D.
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