Here is what seems to be a natural blue/yellow belgium. 1 1/4" X 5 1/2" X 3/4" it has worked a charm on a couple warped razors. the $12.95 was shipped cost:D
the greyish lines are just visual texture "veins" in the stone. both sides are lapped and to the touch, smooth and silky.
the creamy yellow side just did not want to photograph well but it has a nice texture as well.