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- (uncountable) The study of rocks, with particular emphasis on their description and classification.
- (countable) The general composition of a rock or rock sequence.
- 1983, Jeremy S. Delaney et al., “The Nomenclature of Polymict Basaltic Achondrites”, in Meteoritics & Planetary Science, volume 18, number 2, DOI:10.1111/j.1945-5100.1983.tb00581.x:
- The ‘monomict’ meteorites are samples of a single lithology while the polymict meteorites are those containing two or more lithologies.