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silica
A white or colorless mineral composed of silicon dioxide (SiO2). It occurs commonly as quartz and sand, and in many other familiar rocks and minerals, including flint, granite, amethyst, and rock-crystal. Silica is refractory and inert, though it dissolves in hydrogen fluoride and reacts with bases to form silicates. It is used to make glass, ceramics, concrete, and carborundum.
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• GEOLOGY AND PLANETARY SCIENCE
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