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http://straightrazorpalace.com/hones/41850-nagura-pr0n-6.html
post #52 in the thread

true, as far as I know Koma should be a pretty hard stone to make slurry with. I have one that is like that, streaked, and a white one on the way so I will be able to compare.

my experience with different colored Naguras, is that whites are the most aggressive, yellow ones not so much, I ended up selling my yellow Mejiro because it was so slow I could not use it. My white...

Tomonagura is just a piece of stone not necessary the same stone. In my case Oozuko tomonagura.

I have used a tomonagura on CF, works just fine

Seth,
I have seen one of those something like 580g , ~150x50x15 mm or so.

1 - Tenjio Superior selected grade
2- Botan Superior selected grade
3- Tenjio Superior selected grade
4- Mejiro Superior selected grade