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countable and uncountable, plural zeolites
(mineralogy) Any of several minerals, aluminosilicates of sodium, potassium, calcium or magnesium, that have a porous structure (originally, those which swelled and gave off water when heated); they are used in water softeners and in ion exchange chromatography. quotations examples
What I liked best were the zeolites from the stacks which rise out of the sea off the coast near Jaci.
1962, WH Auden, Elizabeth Mayer, translating JW Goethe, Italian Journey, Penguin, published 1970, page 284