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Quartz
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== Mining == Quartz is extracted from [[Open-pit mining|open pit mines]]. Miners occasionally use explosives to expose deep pockets of quartz. More frequently, [[bulldozer]]s and [[backhoe]]s are used to remove soil and clay and expose quartz veins, which are then worked using hand tools. Care must be taken to avoid sudden temperature changes that may damage the crystals.<ref>{{cite web |last1=McMillen |first1=Allen |title=Quartz Mining |url=https://encyclopediaofarkansas.net/entries/quartz-mining-1173/ |website=Encyclopedia of Arkansas |publisher=Central Arkansas Library System |access-date=28 November 2020}}</ref><ref>{{Cite web|url=https://sciencing.com/quartz-extracted-8700692.html|title=How Is Quartz Extracted?|website=sciencing.com|date=25 April 2017|author=Eleanor McKenzie|access-date=2020-01-28}}</ref>
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