Thread: hone ID's please

Couple of ebay hones just wondering if someone can help me ID them. The dark hone (6"x1 3/4"x 1") seems to be some sort of slate and although it fairly soft (the amount of slurry pictured was obtained in about 10-15 circles with a dmt 220 similar to a norton) feels very fine. It is a very dark grey when dry and looks black when wet. The color of the slurry is similar to the dry color.
The lighter colored hone (8"x2"x1") is a cream color (kind of like a vanilla cookie) with a speckled pattern (very uniform across the entire hone) this hone seems substantially harder (40-50 circles to get the pictured amount of slurry). The hone did not change color wet or dry, and the slurry was a much lighter color almost white in comparison.
The slate hone was clean when received, no oil.
The cream hone did have oil on it and was cleaned with dish soap, so it's probably not as clean as it could be.
Both hones where grid lapped on a dmt 220.
Any help with the id as well as input as to where they would fall into a progression if they even are something that could be used on a razor would be greatly appreciated
cheers
-Omid