Whetstones were used to sharpen the edges of ground stone and iron blades of cutting tools, such as adzes, kives and ulus. Jade was a preferred material for whetsones, but other fine-grained stones were also used.
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"The Eskimos still use whetstones made of jade or serpentine ." [...] "Those whestones are often grooved at the top so as to make them thinner and easier pierced for the insertion of a cord." (Émile Petitot, quoted in Savoie, 1971: 151)