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Grit Table / oilstones / Washita oilstone

Natural, no grit number

Washita oilstone

Natural novaculite, soft and porous

Washita has no grit number and extreme specimen variation (sources span roughly 500 to 8000 grit-equivalent). A single very wide estimated range; honestly, it depends on the stone.

Each grade below shows its size in microns, its spread (the published distribution, where a maker or standard gives one; most makers publish none), and where that size lands on the reference scale, a shared yardstick for reading grit numbers across makers.