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--v 190 SULPHIDES. nite, called by Haidinger ‘prismatic cobalt pyrites,’ having the form of mispickel, and in which, according to Haidinger’s mea surements, mm = 69° o', IV = 99° 30'. These are probably either danaite or glaucodote. 77. GLAUCODOTE.—Glaucodote; Breithaupt. _ . . rio. 189. Prismatic. c truncates the edge rr. me 90° o' mm 67 24 Cleavage, c, very distinct; m, indistinct. Opaque. Lustre metallic. Dark tin-white. Streak black, h = su g = 6'97o...6’003. BS 2 + BAs, where B is Co and Fe. In the open tube yields sulphurous acid and a sublimate of arsenious acid. Before the blowpipe on charcoal emits fumes of sulphur and arsenic, and melts into a feebly magnetic globule with a black, rough surface. With borax in the inner flame yields the reaction of iron. When all the iron is separated by borax, the remaining arsenide melted with borax yields a blue glass. BS* + BAs, where B is Co and Fe. Analysis by Plattner:— Cobalt, with a trace of nickel . . . 2177 Ir °n Arsenic 43 - 2 o Sulphur 20-21 Is found in veins in chlorite slate, with cobaltine, towanite axinite, and quartz, near Iluasko in Chile. ’ 78. COBALTINE.—Bright white cobalt; Phillips. Cobalt gris; ITauy. Ilexaedrischer Kobalt-Kies; Mohs. Kobalt glanz; Ilausmann. Kobnltin; Haidinger. Cubic. a 100, 0 ill, e 120, h 140, s 231. The forms e, h, s are hemihedral with parallel faces. aa 90° 0' 00 70 32 oa 64 44 ea 26° 34' ha 14 2 so 22 13 ee 63° 8' eo 39 44 «e 17 31