DEFINITION OF KAOLINITE

A common clay mineral belonging to the kaolin

group, with the chemical formula Al2Si2O5(OH)4. Consisting

of sheets of tetrahedrally coordinated silicon joined by oxygen

shared with octahedrally coordinated aluminum, kaolinite

does not expand with the addition of water and does not

exchange magnesium or iron. A high-alumina clay mineral and

one of the most common of the clay minerals, it often occurs

with quartz, iron oxides, pyrite, and siderite and is formed by

the weathering of feldspars and other silicate minerals.

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