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Highland polymict breccia lunaites and other KREEP-poor highland regolith samples manifest a strong anticorrelation between Al 2 O 3 and mg. The magnesian component probably represents the chemical signature of the Mg-suite of pristine nonmare rocks in its most "pure" form, unaltered by the major KREEP-assimilation that is so common among Apollo Mg-suite samples. The average composition of the ferroan anorthositic component is now well constrained at Al 2 O 3 ∼29-30 wt% (implying about 17-19 wt% modal mafic silicates), in good agreement with the composition predicted for flotation crust over a "ferroan" magma ocean (Warren 1990).

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