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KYANITE, OR CYANITE. S3 Physical Characters. When pure, it is idio-electric. Some crystals, by rub- ibing, acquire negative electricity, even on perfectly smooth planes, others positive electricity: hence the name Dis- thene given by Hauy to this mineral, on account of its ■double electrical powers. Chemical Character. It is infusible before the blowpipe. Constituent Parts. Silica, 29.2 Silica, - 38.50 Silica, - 43.00 Alumina, 55.0 Alumina, 55.50 Alumina, 55.50 /Magnesia, 2.0 Lime, - 0.50 Iron, - 0.50 Lime, 0.25 Iron, - 2.75 Trace of Potash. Iron, 6.65 Water, - 0.75 .Water, 4.9 -—--- 99.00 Klaproth, Beit. Laugicr, Annales b. v. s. 10. JSautsure the Son, du Mus. t. v. Voyages dans les 25 cahier, p. 17. Alpes, NO 1900. Gcognostic Situation. It has been hitherto found only in primitive moun tains, where it occurs in whitestone, mica-slate, and lalc- slate, accompanied with several other minerals. Geographic Situation. Europe.—It occurs in primitive rocks, near Banchory in Aberdeenshire; and in mica-slate in Mainland, the largest of the Zetland islands. At Airolo, on St Go- thard, it is found in a beautiful silver-white mica-slate, associated with felspar, garnet, grenatite, and quartz; in Yo V , ii. e the