( 28 > SECOND GENUS, : " i ZIRCON GENUS. FIRST SPECIES. Zircon. Zirkon.—Werner. Topazius clarus hyalinus jargon, Wall, t. i. p. 252.—' Jargon de Ceylan, Rome tie L. t. 1. p. 229. Id. Born• t. 1. p. 77.—Zirkon, Wid. f. 233. Id. Kirw. vol. I* p. 257. Id. EJhter. b. 2. f. 35. Id. Emm. b. 1. f. 3‘ —Giargone, Nap. p. 105—-Zircon, Lam. t. 2. p. 204- Id. Brock, t. 1. p. 139. Id. Hauy. f. 2. p. 465. External Characters. Its chief colour is grey ; but it occurs alfo greeiv blue, red, yellow, and brown. The varieties of grey are greenifh, yellowilh, aflv and fmoke grey ; fometimes it approaches to blueifh grey. The fmoke and afh grey varieties, when pata approach to white. The yellowilh grey fometimes pafles into yellow. The green pafles into oil-olive, and into an intet' mediate colour between piflachio and leek greeflr and even into grafs green. From the olh' e green it pafles into broccoli brown, (which > s chara&erift^