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…“The deposit at Spruce Pine was formed close to 400 million years ago, from the grinding of tectonic plates that melted rock which then, deep underground, steadily cooked and crystallised into quartz. The exceptional purity of the deposits there comes from the unusual absence of water in their formation.

Only a few other ultra pure quartz mines operate on the planet. One in Norway, another at Chelyabinsk in Russia, and a third in Jiangsu in China…