Found another hone. Need help

[kcb5150]

This time I found a natural stone. This one is exciting in these sense that it came from the same place/lot of stuff that yielded my 1790s stubtail awhile back. Hone was bought in appalling shape. It looked like someone mistook it for a piece of cheese and kept trying to cut through it at right angles to itself. I picked the side with the most uniform abuse and have been lapping it. I am not having a terribly hard time. I think in about two hours I will have a level, uniform surface. No oil whatsoever was in this. Stone is incredibly slick. On the back end I am not lapping, there is a large green blotch of stone. Slanted saw marks on both ends. Stone is greenish blue with some green jello colored blobs mixed in. Have included photos of what the stone is giving off during lapping. Has been a painless process so far. Been using 220 to do the heavy lifting of getting gouges out.