...of potential non-metallic targets, and assuming one may be interested in checking it out, take a look at "Silica" and "Gem Silica".

I was reminded again this morning of the potential for such a target in Arizona by a PR this morning from a company in Quebec - not a local discovery, just an interesting PR.

A related mineral, Chalcydony, is ubiquitous in Arizona, but less commonly found in commercial quantities.

FWIW