Free of impurities, Spruce Pine quartz has been crucial to the supply ... Sibelco sells its white quartz sand under the brand name IOTA, which the company states online is “indispensable in ...
Now cooled and worn, the rocks around Spruce Pine has the look of a dirty snowball thanks to a combination of feldspar, mica, and quartz. When ground up, it just looks like white sand, but when ...