Here's a more recent article, about the relation of Acap-Lod and models of
the parent body: http://www.lpi.usra.edu/meetings/lpsc2007/pdf/2254.pdf
Quoting from that article: "The grainsize distinction between acapulcoites
and lodranites is taken to be at 500 µm [1]."
[1] McCoy T. J. et al. (1996) Geochim.Cosmochim. Acta 61, 2861-2708;
McCoy T. J. et al. (1997) Geochim. Cosmochim. Acta 61, 623-637 & 639-650
This "grainsize distinction" would make NWA 2871 a so-called "borderline case"
Best wishes,
Bernd
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