The composition of stony meteorites (VI). a) The MgCr relationship in some basaltic achondrites, Apollo 11 soil and Apollo 12 rock 12038 b) The Ba-rare Earth relationship in stony meteorites and Apollo 11 rocks and soil

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Several elements, mainly lithophile, have been classified into three groups, according to tendencies and relationships in the basaltic achondrites:Fe, Si and Mn - concentrations uniform and equivalent, in eucrites and howarditesCa, Al, Sc, Ti, Sr, Y, Zr, Nb, Ba, rare earths, Hf, Ta, Th and U - concentrations in eucrites greater than in howardites.Mg and Cr - concentrations in howardites greater than eucritesIn part (a) of this paper, the MgCr relationship is discussed, and in (b) the relationship between Ba and one rare earth, Nd.In both (a) and (b), the relationships are such that there appears to be a close connection between the composition of basaltic achondrites and the lunar surface.

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