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So my Zulu Gray is shale. What qualities can be tested that would make one qualify it to being useful to examine it further. I realize that every natural hone was once a rock but not every rock can...

I'm with you guys. I live in an area with a lot of shale, different types of slate, petrified wood and basalt. I've heard of all of this types being hone material. My question is similar, which...