A friend gave me a razor hone some time ago (black stone, second from the bottom), and I'd like to know what kind of stone it is. I added a number of other fairly well known stones for colour reference, and I did weigh and measure all the loose stones to calculate their density.

From top to bottom:

Washita, density ~2,00 (fairly large margin for error, too small to get the accurate weight)
Smiths Soft Arkansas
Norton Hard Arkansas (Translucent, I'd say), density 2,65
Mystery hone, density 2,80
Escher, thurungian if I'm not mistaken.

The mystery hone is dark grey or black, a bit heavier than the translucent arkansas as the density shows, it used to have remains of a label with the word "razor" or something like that but it was removed by the previous owner. Water does not "wet it", it mostly just gets pushed off the stone by the razor when you draw it across. Worked well with oil (WD40).

I am not skilled at sharpening razors (yet), nor do I have a descent strop or stropping compound. (I'm getting there, sooner or later.) I did however make an attempt to hone a few old razors on the hard arkansas, the escher and the mystery hone, the arkansas and escher did make the razors sharp enough for cutting arm hair, the mystery hone gave a clearly better result - not nearly good enough to shave with it, but I'm guessing that's where a strop would make a big diffrence.

Anyone have an idea what kind of hone it might be?

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