A sedimentary rock or mineral deposit that combines clay minerals with calcite (calcium carbonate), forming a mixed-composition material.
From Latin 'argilla' (clay) + 'calcite' (from 'calx,' calcium). A technical geological term naming a specific rock type by its mineral components.
Argillocalcite rocks often form in ancient estuaries where river clay mixed with shell-rich ocean sediments—they're like geological memorials of shorelines from millions of years ago!
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