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countable and uncountable, plural lithologies
(uncountable) The study of rocks, with particular emphasis on their description and classification. examples
(countable) The general composition of a rock or rock sequence. quotations examples
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