[Rockhounds] The Pegmatite in Your Cellphone - Spruce Pine Mining District, North Carolina

[Paul]

The Ultra-Pure, Super-Secret Sand That Makes Your Phone Possible
by Vince Beiser, Wired Magazine, August 2018
https://www.wired.com/story/book-excerpt-science-of-ultra-pure-silicon/

The Mineral City: Exploring the Spruce Pine Mining District
The past can be traced deep beneath Spruce Pine’s surrounding
mountains — and it also can be mined. by Bryan Mims, Our State
https://www.ourstate.com/mineral-city/

Swanson, S.E. and Veal, W.B., 2010. Mineralogy and petrogenesis
of pegmatites in the Spruce Pine District, North Carolina, USA.
Journal of Geosciences, 55(1), pp. 27-42.
http://www.jgeosci.org/content/jgeosci.062_2010_1_swanson.pdf
http://www.jgeosci.org/detail/jgeosci.062

Spruce Pine Mining District
https://en.wikipedia.org/wiki/Spruce_Pine_Mining_District

Yours,

Paul H.