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Uchigorami you meen Uchigomori ??
If so they are not so good to finish your razors on, but very nice prepolishers. If i was you i get final finesher and use it after 16 k or Thuri, it dose not have...

Jim I have one Takashima that is pretty hard too, maybe the hardest non Kyoto stone i have seen color of the stone looks bit like yours no skin thought.
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Yes there are some sparkling black spots on red color of the skin but so there is on Hakka, Ozuku, Hideryama and many other mines, heavy toothed is on new stones too :)
The wird part is that it...

I use right now Unknown one, very wird stone and unusual, it is soft but super super fine, never have seen such a stone.
I fist even thought that it is not Jnat because feeling and feedback feels...