Natural Iyo Nagura stone -Tomonagura- ± 50-90 gr. (いよ ・名倉)
Japanese Iyo Nagura stone, about 50 grams
High quality Japanese Nagura stone. This natural "slurry" stone comes from the Iyo mine, the oldest mine in Japan (started 1500 years ago). The Iyo mine is located in the Ehime province in Japan.
The Nagura stone is very good to use on the hard Shapton stones but also on natural Awasedo / Honzan stones from Japan. These stones are also used as "Tomonagura" stones for the traditional grinding of Japanese swords and for the preparation of sharpening stones for razors. Larger specimens from the Iyo mine are used as a grade Awasedo polishing stones.
This stone is specifically intended for creating a slurry on Japanese water stones. This slurry provides a faster grinding result with a better polishing. Only to be used on hard polishing stones (from # 4000 grit).
These special Nagura stones ensure that the surface of your Japanese water stone fills up less quickly and stays cleaner.
Because of the different (non-rectangular) shapes it is not possible to select a specific stone. If you want to choose a stone yourself then you are of course welcome in Hoevelaken (by appointment). If you order a stone online, we will choose a nice one.
- Dimensions of the stone: varies
- Grain: between # 6000 and 10,000 grit
- Weight between 46 and 98 grams
- Natural stone
A Nagura stone is very important when sharpening traditional Japanese knives.
Natural sharpening stones normally consist of about 2/3 SiO2 (silicon dioxide), which provides the grinding effect and about 1/3 Muscovite (A = K +, B = Al3 +, X = Al3 +) KAl2 (AlSi3) O10 (OH) 2 that serves as binding material. The stones were formed about 70 million years ago. Because they were formed from sediment that had been submerged, you would think that they are stable when they are wet. But after the stones have been carved out and cut to size, this can change, because the binding material, which is at least partially soluble in water, can dissolve over time and peel the abrasive particles unevenly. This decomposition process, however, is very slow so these stones may be under water for a longer time, but for sustainability it is better not to leave these stones in the water continuously if you do not use them every day.