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EMERY. 41 Use. tt is used for polishing hard minerals and metals, and hence is art important article in the arts. Before using, it is ground into powder of various degrees of fineness, according to the use that is intended to be made of it. The different kinds of powder are obtained, by repeated ly diffusing the ground emery in water, and allowing the water to settle a longer or shorter time, according as we wish a fine or coarse powder. It is used with water for polishing stones; but with oil for polishing metals. Observations. Magnetic iron-stone, and specular iron-ore, from their being frequently used in place of emery, in polishing hard bodies, have been confounded with it. 6. Corundum. Korund & Demant-Spath, Werner. fcorund, IVid. s. 237.—Adamantine spar, Kirtv. vol. i. p. 335. Demant-Spath, Emm. b. 1. s. p. & b. 3. s.-229.—Spato ada- mantino, Nap. p. 223.—Corindon, Lam. t. 2. p. 356.—Le spath adamantine, Broch. t. 1. p. 356.—Corindon, llauy, t. 3. p. 1.—Imperfect corundum, Greville & Bovrnon, Phil. I runs. 1798 and 1802.—Korund & Demant-spath, licuss, 2. th. 2; s. 16, & 12.—Id. Lud. b. 1. p. 103.—Id. Suck. 1. th. s. 439.—Id. Bert. s. 290.—Id. Mohs, b. 1. s. 112, & 120.—Corindon harmophane translucide & Corindon harmo- phane opaque, Lucas, p. 259, & 260.—Corindon adamantine & Corindon adamantine noiratre, Brong. t. 1. p. 429, 430.— Corindon harmophane, Brard, p. 110 Corindon harmo phane opaque, llauy, Tabl. Comparat. p. SO. — Korund & Demant-spath, Steffens, b. i. s. 17, & 19. Exttrnal