Mineralogy of Apollo 15415 ``Genesis Rock'' : Source of Anorthosite on Moon

Physics

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Scientific paper

PETROGRAPHIC, microprobe and X-ray data were obtained from thin section 15415,14 and 1-2 mm fines 15415,28, part of the anorthositic rock returned by Apollo 15. The section consists of ~97% coarse (1-4 mm) plagioclase and ~3% pyroxene associated with a trace of ilmenite. The pyroxene occurs as small (~0.05 mm) blebs both within and between plagioclase grains; in addition, several larger (~0.6 mm) pyroxene grains occur along boundaries. The fines consist of ~98% plagioclase with the rest being glass spheres and soil particles. Electron microprobe analyses were made of ten plagioclase points and ten pyroxene grains using standard procedures1.

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