clay mineral

any of a group of hydrous aluminum silicate minerals, as kaolinite, illite, and montmorillonite, that constitute the major portion of most clays.

1945–50 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
clay mineral
any of a group of minerals consisting of hydrated aluminium silicates: the major constituents of clays

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The mud is made from a variety of materials such as the clay mineral bentonite.
Clay mineral colloids play important roles in the adsorption of polar organic contaminants in the environment.
Say, for example, that you determine there are both chlorophyll absorptions and clay mineral absorptions in a spectrum.
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