As an aside, we recently went camping about 25 miles NNW of Tonopah, Nevada.
We found an old mining operation where obsidian balls (called Apache tears
after polishing) were being taken out of a mountainside. There were
bazillions of them.

I often wondered how a large operation like that would process them. Or, if
they used them for something else besides tumbled stones for jewelry.

Any hints?

Steve