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montmorillonite

A monoclinic mineral, (Na,Ca)0.33(Al,Mg)2Si4O10(OH)2.nH2O ; smectite group; expansive and cation exchangeable; perfect basal cleavage; in bentonite clays formed by 2054 alteration of volcanic ash or mafic igneous rocks. The chief constituent of bentonite and fuller's earth. Compare: beidellite; hectorite.

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  • ed.young
  • (Milwaukee, United States)

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