Hello...
Can someone, please, identify this stone...

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It is very old, I got it from my GF's father...
His grandfather used to hone his razor with it...
It looks like natural stone because I can see it's structure and it doesn't look homogeneous like my synthetic hones...
It is very small, it measures just 5" x 0,9" x 0,3"...
It feels way finer than mine 6k hone, IMHO it could be around 10k...
It also produced a black slurry when it was lapped...
I tried to hone my razor with it and got very nice and sharp shaving edge, without the need to polish it on CrOx...

What could this mysterious stone be?