Describing sedimentary rock or mineral deposits containing both clay minerals and magnesium-rich minerals or compounds.
From Latin 'argilla' (clay) + 'magnesian' (from 'magnesia,' magnesium oxide, named after Magnesia in ancient Turkey). Technical geological descriptor of mixed mineral composition.
Argillomagnesian rocks often form in ancient evaporitic basins where clay mixed with mineral-rich brines—they contain clues about ancient climates and water chemistry!
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