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Well, the plates on the machines are interchangeable since once one is loaded with a certain grit or material you use another for a different material so I guess if you had a mind to you could fill...

If you are going to be doing a lot of exploration for hones it might be convenient to get a vibrating lap machine. You just add water and some media like alumina or cerium oxide and let it run a few...

You have a college nearby? Contact the Geology Dept. They usually have a lab and true lapidary saw they might let you use.

This is a pic of some purple quartzite found in the devils lake area of Wisconsin, unique stuff.

If it's quartzite that's metamorphosed sandstone and is tough stuff indeed. You need a proper saw to cut that stuff like a diamond saw.

It's not slate. Though slate comes in many colors it's usually in layers that are obvious and is very fine grained which that it not. Basalt is dark, very dark almost black.

With any rock unless...