Describing sedimentary rock or soil containing significant amounts of both clay and iron oxide, often giving it a reddish or brownish color.
From Latin 'argilla' (clay) + 'ferruginous' (from 'ferrum,' iron + '-ous,' containing). Technical geological term combining two key mineral components.
Many ancient soils and laterites are argilloferruginous—they get their rusty red color from iron minerals mixed with clay, and they're incredibly important for mining and agriculture!
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