Originally Posted by
RayClem
Although identifying a stone is interesting, what is really important is how it performs. How hard is the stone? How fast does it cut? Is it a bevel setter, a mid-range, or a finisher? How easily can you develop a slurry?
Of course, the most important question is: What kind of edge does it leave on your razor: If it does what you want it to do, it really does not matter what kind of stone it is or where it came from.
Lap the stone until you get a flat, smooth surface and see what it will do with it. Then come back with the results.