Fig. 2.

Back-scattered electron images of Apollo 15 soil grain 15404,51. Phase abbreviations are as follows: Ap, apatite; Pyx, pyroxene; Ox, Fe-Ti oxide; Pl, plagioclase; Mer, merrillite. (A) BSE image mosaic showing the two lithologic clast types that occur in sample 15404,51. The alkali-suite clast and impact melt breccia portions of the image are labeled accordingly. (B) BSE image showing one of the apatite grains analyzed by SIMS. The black circles with white numbers indicate analysis spots and their corresponding analysis numbers. (C) BSE image showing one of the apatite grains analyzed by SIMS. The black circle with the white number indicates the analysis spot and its corresponding analysis number.