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That’s frustratingly common. “I’ve evaluated thousands of quartz samples from all over the world,” said John Schlanz, chief minerals processing engineer at the Minerals Research Laboratory in Asheville, about an hour from Spruce Pine. “Near all of them have contaminate locked in the quartz grains that you can’t get out.” Some Spruce Pine quartz is flawed in this way. Those grains, the washouts from the Delta Force of the quartz selection process, are used for high-end beach sand and golf course bunkers—most famously the salt-white traps of Augusta National Golf Club,16 site of the iconic Masters Tournament. A golf course in the oil-drunk United Arab Emirates imported 4,000 tons of this sand in 2008 to make sure its sand traps were world-class, too.
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Vince Beiser (The World in a Grain: The Story of Sand and How It Transformed Civilization)