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Line 1: − '''Quartz''' is the most common mineral found on earth. More accurately, Silicon Dioxide, quartz has a chemical composition of SiO<sub>2</sub> arranged in a repeating latice forming [[crystal|crystals]]. If the quartz is pure it would be clear, but the colored variations are created because of impurities in the crystal.+ − <br> Quartz is used in a number of applications such as [[glass]] making, optical lenses, abrasives, in electrical components or decorative gemstones or other stone. − [[Category:Minerals]]
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