Fluorine in lunar samples: implications concerning lunar fluorapatite

Details Fluorine in lunar samples: implications concerning lunar fluorapatite Fluorine in lunar samples: implications concerning lunar fluorapatite

Jun 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973gecoa..37.1457r&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 37, Issue 6, pp.1457-1462

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Scientific paper

The F contents of a number of Apollo 14 and 15 samples range from less than a ppm for anorthosite rock fragments to ~165 ppm for some soils and breccias. Apollo 15 soils tend to have lower F contents (50-70 ppm) than soils from other sites. In most cases samples were run simultaneously with W-1 in which F was determined to be 216 ( ±11) ppm. The F / P 2 O 5 ratio is 0·032 ± 0·005 in soils and rocks. A correlation exists in soils between F, P 2 O 5 , and that fraction of the Cl which is insoluble in hot water. The F / Cl r ratio in soils and rocks, though different, requires that the phosphate phase involved be fluorapatite; this is consistent with mineralogical observations. F, like Cl, is correlated with KREEP elements at all sites for which data are available.

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