Quartz is actually a really versatile substance, and is found in abundance on Earth. Because it is so hard, quartz is often used as an abrasive and is used in sand blasting, scouring, and in sanding and sawing. In addition, quartz crystals are often used in electronic devises, such as cell phones, watches, clocks, televisions, computers, and many other items. Historically, quartz was used to make arrowheads and other sharp tools, and today is also used for jewelery.
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