go FLINT GENUS. THIRTEENTH SPECIES. Corundum. Korund.—Werner. lb. Wid. f. 237—Adamantine fpar, Kirw. vol. 1. p. 335’ =Demant fpath, Emm. b. 1. f. 9. & b. 3. f. 229--'' Spato adamantino, Nap. p. 223—Corindon, Lam. t. *• p. 356..—Le fpath adamantine, Broch, t. 1. p. 356.-^ Corindon, Hauy. t. 3. p. 1—Imperfect corundum, G? 1 ' ville and Bournon. Philof. ‘Tranf. 1798 1802. External Characters. > Its. colour is greenilh white of various degrees ^ intenfity, which paffes into light greenilh grey, ai^ even into mountain and afparagus green ; it is fom c ' times alfo pearl grey, which paffes into flelh red, ^ in fome varieties it is reddilli externally, but greeh^ internally. It occurs maffive, diffeminated, in rolled pieces? and cryftallized. Its cryftallizations are fnnilar 10 thofe of fapphire. The cryffals are middle fized and imbedded. Externally they are dull and rough. 'fliff