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Just looking at the finished surface it looks like Porphyry which is an igneous rock. Probably not a good hone for straights.

Water is the premier shaper of this planet. It formed the Grand Canyon with a little uplift help.

One of the mining methods they used back in the 19th century was hydroliking where water was used to remove rock. Probably to sharpen a razor with running water from a faucet would take a few hundred...

Really just about anything can be a hone when you really think about it. The question is are there better choices? You know if you put your razor under running water long enough you'll have the...