Silica is a compound composed of silicon and oxygen. The amorphous form is used in cosmetics and personal care products. It is a hard, unreactive, colourless compound that occurs as the mineral quartz and as a principal constituent of sandstone and other rocks. For cosmetic use, the quartz is ground into a fine powder and has many uses including being able to absorb sweat and sebum and leave the skin with a nude feeling when used in certain sunscreen formulations. It is also often used to replace plastic microbeads for purposes of mild exfoliation.
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