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Here are some slurry photos.

The top one was not to hard, but the bottom was one of the hardest stone I lapped.

Is have no layers,just saw marks,

the top one it not have glitters, and no patterns when wet,it may be manmade you are right. the small one I remember i use to have a La Luna, french stone similar like this.
Thank you again
Livio

Thank you, at least the small one is natural, like glass.the bigger one I am not sure , but also very fine, not like the small one but fine.

Hello, some new stones from Ebay.The big one is a 6x2x1/2 medium hard,green color , white slurry,mounted with in a box with a strop.The small one is
5 1/2x 1 1/4 x 3/4, very hard, raise some dark...