A fine-grained whetstone lubricated with oil, useful for good sharpening.
A type of rock useful for sharpening things particularly knives and razorblades.
multiple hone record, or whetstone, utilized for whetting resources when lubricated with oil.
A slab of fine-grained rock useful for imparting a keen edge to resources, and so known as because oil is employed for lubricating its rubbing-surface. Good oilstones are often manufactured from novaculite, a fine-grained number of quartz.