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162 SULPHIDES. Combinations, oh, oz, oaz, oabxzrr / . Cleavage, o, perfect; b less distinct. 1 racture conchoidal, small and imperfect. Opaque. Lustre metallic. Brass-yellow, inclining to copper- red ; acquires a tarnish. Streak greyish-black. Feebly mag netic. Brittle. 11 = 3'6...4'5. G = 4'6. .47. In the matrass unchanged. In the open tube yields sul phurous acid, but no sublimate. Before the blowpipe on char coal in the inner flame melts into a greyish-black highly mag netic bead. Soluble in hydrochloric acid with evolution of hydrosulphurie acid, and leaving a residue of sulphur. r nr Fe 5 £e, iron 60’49, sulphur 39‘5l. Analyses of pyrrhotine a from Treseburg; b from Bareges, by Stromeyer; c from Congonhas do Campo ; d from Fahlun, by Plattner ; e a very magnetic variety ; f less magnetic, from the Lalliat mountain near Sion in the Valais, by Berthier; g from Bodenmais, by II. Bose ; h from Modum, by Scheerer j i from Klefva m Smaland, by Berzelius ; k from liaipootanah, by Middleton:— a b C d e Iron . . 69-29 56-38 69 61 69-72 69*8 Sulphur . 40-71 43-62 4043 40-22 40-2 9 h i k Iron . . . 61-02 66-03 67-91 62-27 Nickel . . — 2-80 3 05 Cobalt . . — — 0-09 - . Manganese . .— 022 Copper . . — 0'40 0-45 Sulphur . . 39-10 40-46 3827 37'73 Very seldom distinctly crystallized ; usually massive and dis seminated. Occurs principally in beds in the older rocks, with magnetite, iron and copper pyrites, blende; seldom in veins with silver, pyrargyrite, arsenic, galena, calcite, quartz ; in various meteor ites. Is found in veins with silver at Kongsberg in Norway and Andreasberg in the Harz, well crystallized ; in veins in diorite and slate at Treseburg and Thale in the Harz ; in beds at Bodenmais in Bavaria, Breitenbrunn and Geycr in Saxony, Querbach and Gieren in Silesia, Auerbach in Baden, Valsugana in the Tyrol, Fahlun in Sweden, Wezelukow in Bohemia, Zoppons in Moravia, Obedach in Stiria, at the base of Moel Elion in Carnarvonshire; disseminated in granite and greenstone at Bareges, Bagneres de Luchon, the Maladetta in the Pyrenees, Nantes in France ; at Appin in Argyleshire, and in some of the hills of Galloway in Scotland; Congonhas do Campo in the