clay mineral

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

Origin:
1945–50

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clay mineral
 
n
any of a group of minerals consisting of hydrated aluminium silicates: the major constituents of clays

Collins English Dictionary - Complete & Unabridged 10th Edition
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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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