Clay

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Clay is a substance present in most kinds of soil. Geologists define clay as extremely small particles of soil that measure less than 4 microns, or 0.000157 inch, in diameter. The word clay also refers to earthy material composed of certain kinds of silicate minerals that have been broken down by weathering.

Bentonite

Bentonite is a type of clay that swells to several times its original size when wet. It is an important industrial material used to bond molding… See more »

Oil shale

Oil shale is a soft, fine-grained sedimentary rock from which oil and natural gas are obtained. Oil shale consists of light brown layers of silt… See more »

Fuller's earth

Fuller's earth is a clay-rich material used mainly as a cleaner and purifier. The material consists mostly of hydrated aluminum silicates--minerals… See more »

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Clay

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