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A monoclinic mineral, (Na,Ca0.5 )0.3 Al2 (Si,Al) (sub 4) O10 (OH)2 .nH2 O ; smectite group; aluminum rich and poor in magnesium and iron; a common constituent of soils and certain clay deposits (e.g., metabentonite). CF: montmorillonite

Source: Dictionary of Mining, Mineral, and Related Terms

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