Unknown Mine Asagi Awasedo Fine Grit Japanese Natural Sharpening Stone 2lb. 9.3oz. (1168.4g) 211mmX63-77mmX28mm
#6000 to #10000 for medium range in the fine grit for high carbon blade It is a very heavy stone in the size. I do not know which mine it derived from, but if I guess it, it might be Ozuku asagi that looks similar with this stone.
It raises very good amount of black color slurry quickly. It is kind of hard stone. It might need tomo nagura or the device to produce the slurry (worn Diamond lapping stone).
(Scale; 1 to 10, 1-3 is very soft muddy rough grit whetstone 3-6 is soft medium grit whetstone, 6-8 is hard medium grit whetstone; 8-10 is fine grit whetstone)
Particle Size----------8.9 It might make the sounds squeaky on the sharpening surface, but they do not make scratches. It makes my white II steel kasumi kiridashi blade knife Hagane became from semi-mirror finish to mirror finish. Jigae became kind of light frosted color finish.
(Scale; 1 to 10, 1-3 give deep scratch marks to the steel, 3-5 is delete the 1-3 scratches, 5-8 makes the steel cloudy, 8-10 makes the steel semi-mirror finish or mirror finish)
Natural whetstone has wider capacity than artificial whetstone, and actually, we do not know until sharpen blade on the hone for a while. Because artificial whetstone molecules do not break down to smaller sizes, but Natural whetstone molecules are possible to break down to smaller sizes, and those molecules are mixed with sharpened steel molecules, and make Jigane as suitable Jigane color, and Hagane as suitable Hagane color. It is natural mystics.