There might even be sources richer than 50 ppm for it, but bauxite is already mined for aluminium, so that part comes for free.
For a while we imagined Gallium Arsenide would replace Silicon in HPC, but then Seymour Cray died and there was nobody stubborn enough to make it work.
For a while we imagined Gallium Arsenide would replace Silicon in HPC, but then Seymour Cray died and there was nobody stubborn enough to make it work.