a very common mineral, hydrated aluminum disilicate, Al 2 Si 2 O 5 (OH) 4 , formed by the alteration of other minerals, especially feldspar: the most common constituent of kaolin.

1865–70; kaolin + -ite1

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World English Dictionary
kaolinite (ˈkeɪəlɪˌnaɪt)
a white or grey clay mineral consisting of hydrated aluminium silicate in triclinic crystalline form, the main constituent of kaolin. Formula: Al2Si2O5(OH)4

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American Heritage
Science Dictionary
kaolinite   (kā'ə-lĭ-nīt')  Pronunciation Key 
A soft, white triclinic mineral occurring in friable masses. Kaolinite forms as the result of the hydrothermal alteration or weathering of feldspar. It is used in the ceramic industry. Chemical formula : Al2Si2O5(OH)4.
The American Heritage® Science Dictionary
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Example sentences
Fire clay comprises mainly diaspore, halloysite, and/or kaolinite.
The kaolinite was a pure form of the mineral that is produced commercially for use in paint pigments.
This enables dissolution of kaolinite and precipitation of gibbsite.
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