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There are 2 sellers I know of that are selling jaspers and agates as hones on E-bay. I bought the green quartzite above from one of them.

These type stones, much like an Arkie, perform better...

Your description sounds like it could be an Owyhee jasper or a similar agate like stone. They are glassy and can be very good finishers, I have several jaspers. The upper left stone in the pic below...