Definition of "polymict"

It is pointed out that the breccias among stony meteorites are mainly of two kinds : (a) breccias in which the enclosed fragments are of the same material as the surrounding principal mass of the stone: it is proposed to call this kind of breccias “monomict breccias,” and (b) breccias in which the enclosed fragments are of a foreign material as compared with the surrounding principal mass of the stone: it is proposed to call these breccias “polymict breccias.”

1952, Walter Wahl, “The brecciated stony meteorites and meteorites containing foreign fragments”, in Geochimica et Cosmochimica Acta, volume 2, number 2, pages 91–117

The ‘monomict’ meteorites are samples of a single lithology while the polymict meteorites are those containing two or more lithologies.

1983, Jeremy S. Delaney et al., “The Nomenclature of Polymict Basaltic Achondrites”, in Meteoritics & Planetary Science, volume 18, number 2