Originally Posted by
DaveW
Your trans ark will be more of a grading stone (it'll wear down the surface of natural stones), which can be useful itself. It probably won't release any particles unless it's rubbed against a hard synthetic stone or perhaps a soft ark stone of some sort.
Probably a slate, but it could be anything. If it's coarse and bitey on slurry, then grading it and not allowing it to slurry is a good option. As it gets slow, you can do your initial strokes with a little bit of pressure.
I wish sellers would not list things with misleading titles when they don't know for sure what they are (not singling out this seller, just frustration with ebay).