polymict

1. not comparablegeographyContaining multiple types of rock.

   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, →DOI

   1 more example

   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, →DOI, pages 91–117

plural polymicts

1. A breccia containing multiple types of rock.