(1) http://www.lpi.usra.edu/meetings/lpsc2006/pdf/1344.pdf : S.M. Kuehner suggests further mineralogical-grain evidence that the rare "angrite" metorites may be fragments of Mercury.(

2) http://www.cosis.net/abstracts/EGU06/02387/EGU06-J-02387.pdf : M. Sgavetti suggests evidence of rocks other than anorthosites on Mercury: "...[T]he analysis of recalibrated Mariner 10 data revealed a previously undetected diversity of surface composition, and MIR emission spectra displayed absorption features attributed to minerals that are common components of intermediate and mafic rocks, including
basalts."