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I think I leave it the way it is. This is my best option for now.

Quick update,

dry out slurry has perfectly white color. I will send later more pictures when I will be done with stone preparation.

Yes,

it worked very well, stone is perfectly clean. I did this as it was one of the options suggested by SRP members and work out very well. Stone is very clean. Now I just need to make it flat...

Stone was covered with some kind of oil, dark smelly. like from some machine or burn out oil from engine when I got it. I want to clean it up before lapping as was impossible to even see what was...

OK,

it could be LI or CF. I don`t have any experience with natural stones at all!!! Only I have are two Chinese stones, also very different.
I think either stone (I think as I`m not expert)...

What could be grit of this stone? Also when I made a slurry and seems like a mudstone. Slurry is very thick like mud.

97397973989739997400974019740297403

Hello good people,
I need your help. I got this stone and spent many hours cleaning it as it was very dirty and cover with oil like substance. However I made it to the end using many gallons...