An extremely common mineral found in a number of forms. Sand is predominantly silica and chronic or acute exposure to the silica dust generated by blast cleaning using silica sand abrasive can cause a debilitating disease known as silicosis. Silicates (compounds containing silica) are also the predominant component of clay, diatomaceous earth, mica, and talc, which are widely used as extender pigments. With the exception of clay, all have been demonstrated to produce fibrosis of the lung.

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