| silicates | The generic term for salts derived from silica or the silicic acids. They contain silicon, oxygen, and one or more metals, and may contain hydrogen. (12 Dec 1998) |
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| aluminum silicates | Any of the numerous types of clay which contain varying proportions of al2o3 and sio2. They are made synthetically by heating aluminum fluoride at 1000-2000 degrees c with silica and water vapor. (12 Dec 1998) |
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| magnesium silicates | A generic term for a variety of compounds that contain silicon, oxygen, and magnesium, and may contain hydrogen. Examples include talc and some kinds of asbestos. (12 Dec 1998) |