Blue Aoto (a3630)

Grit lv is approx. 2-5k make them super nice Naturals for pre polishers or even finishers for many knives.
They are soft and very easy to make uniform finish with 
It is very hard to find very good Aoto stones as many of them with very hard inclusions and cracks 
Those that I have selected that is extra clean and fast 

Aotos is not mined anymore so this is very old stock