Silica is a chemical compound which often occurs in a crystalline form known as “quartz” or sand. Crystalline silica is found in soil, sands, ores, rocks, flint, gravel, slate, diatomaceous earth, concrete, mortar, plaster, refractory materials, clay, limestone, shale, silica flour, bricks, and abrasives, among other natural and man-made substances. Crystalline silica is considered respirable and can be invisible to the naked eye.

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