4 ms·
Spruce Pine - https://en.wikipedia.org/wiki/Spruce_Pine_Mining_District https://en.wikipedia.org/wiki/Spruce_Pine_Mining_District It's the purest source, but l
by kurthr 3y ago
Spruce Pine - https://en.wikipedia.org/wiki/Spruce_Pine_Mining_District https://en.wikipedia.org/wiki/Spruce_Pine_Mining_District
It's the purest source, but lots of cheap PV poly is made from other stuff.