Abstract
Petrography and mineral compositions show that ALHA81005 is a lunar highland regolith breccia and is the first known lunar meteorite. Lithic clasts are abundant and most are members of the anorthosite‐norite‐troctolite highland suite. Plagioclase compositions in lithic clasts and single grains are calcic (An94‐98). Pyroxene compositions, Al‐Ti and MnO‐FeO relationships support a lunar highland origin. A non‐KREEPy source region is indicated, and the unexplored far side of the moon cannot be ruled out as a potential source.
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