Fluorine in lunar samples: implications concerning lunar fluorapatite |
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| Authors: | GW Reed S Jovanovic |
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| Institution: | Chemistry Division, Argonne National Laboratory, Argonne, Illinois 60439, U.S.A. |
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| Abstract: | 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 ratio is 0·032 ± 0·005 in soils and rocks. A correlation exists in soils between F, P2O5, and that fraction of the Cl which is insoluble in hot water. The 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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