Sungari stones usually have manganese lines which look like cracks

Rozsutec stones always have a color pattern

Columbia Gorge Stoneworks

Turkish Oilstone stones should be used with oil as a lubricant

emerald green

venev archer series metallic cbn stone 6 x 1 back-in-stock Sungari stones usually have manganeseVenev Archer Series Metallic CBN Sharpening Stones are used for sharpening knives made of any steel using guided knife sharpeners (Hapstone, TSPROF, and other Edge Pro compatible sharpening systems). Venev Archer ('Archer Cubed') consists of a 3mm thick CBN bearing plate mounted on an Edge Pro aluminum base. CBN (Cubic Boron Nitride) is the second hardest material after diamond. The CBN bearing plate contains evenly distributed CBN grains with copper