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Tour malme. Fiolet, thumerftein; Blue, fappare; Black, and hexagonal, or volcanic, are alfo bafaltic hornblende; Red Jhorls, longitudinally ftreaked, have been latelv found in Hungary. i Raab. 168. I have alfo obferved one in Lefke’s collecüon O. 171; but fo fmall, and fo firnily ftuck in quartz, that I could make po cxperiments upop it. Rubellites are alfo fo called, i6th Species. Tourmaline. Theufual colour is brown, often fo dark that, when not held to the lighr, it feems black, yet often fo light as to approach to the hyacinth red; fometimes it verges to the olive green, or dark green; it is even found blue. Mr, Bergman teils us, that of Ceylon is dark brown, or yellow- ifli; that of Brazil, greenifh, bluifti, reddifh, or yellowifh brown; that of Tyrol, by refledted light, blackifh brown; but, by tranfmitted light, yellowifh, or, in thin pieces, greenifh. That of Switzerland blackifh. Its internal luftre, 2.3. Tranfparency, 3.4.2. and 1, when black. It is found in dctached blunt-edged pieces, or grains, or cryftallized in flender three or nine fided prifnis, with a tetrahsdral fummit. The