Petrographic studies of Apollo 16 samples indicate that rocks 62295 and 68415 are crystallization\ud products of highly aluminous melts. 60025 is a shocked, crushed and partially annealed plagioclase\ud cumulate. 60315 is a recrystallized noritic breccia of disputed origin. 60335 is a feldspathic basalt\ud filled with xenoliths and xenocrysts of anorthosite, breccia, and anorthite. The Fe/(Fe + Mg) of\ud plagioclase appears to be a relative crystallization index.\ud Low pressure melting experiments with controlled P_(o2) indicate that the igneous samples crystallized\ud at oxygen fugacities well below the Fe/FeO buffer. Crystallization experiments.at various pressures\ud suggest that the 62295 and 68415 compositions were produced by partial or complete melting of\ud lunar crustal materials, and not by partial melting of the deep lunar interior
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