The sulfide minerals reported to be present in lunar rocks include troilite, mackinawite, the discredited mineral “chalcopyrrhotite”, sphalerite, chalcopyrite, and cubanite. Apollo 12 sample 12021,134 contains these last two minerals, and the first chemical analyses of the Cu-Fe-S phases are presented. These minerals occur along cracks and grain boundaries within troilite and are probably exsolution products formed at low temperatures (i.e,100°-300°C) from a cupriferous troilite.

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