A beautiful commercial-size uchigumori bench-size stone that displays patches of red renge and light-colored "catfish" namazu. Although this stone affects a wide variety of steel, it excels with bi-metal blades such as those from Japan comprising both hard steel and softer iron. Containing a very complex variety of minerals represented by the coloration of the stone, it is certainly silica dioxide and aluminum oxide grit-rich as demonstrated with Japanse kanna-hand plane & hardened knife bi-metal blades.
 
Uchigumori is a luxury stone and it is not a necessary type for sharpening mono-metal western blades such as knives, but it is important for the upkeep of historic Japanese bi-metal blades. We in the West here appreciate the character of Uchigumoir as it sets a standard in blade maintenance.
 
205mm x 74mm x 39mm thick
1373 grams
Mohs 3 hardness
$1100