3 ms·
I've read Spruce Pine, North Carolina has the world's purest source of natural quartz best suited for making silicon wafers. https://en.wikipedia.org/wiki/Spru
by pkaye 4y ago
I've read Spruce Pine, North Carolina has the world's purest source of natural quartz best suited for making silicon wafers.
https://en.wikipedia.org/wiki/Spruce_Pine_Mining_District https://en.wikipedia.org/wiki/Spruce_Pine_Mining_District