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158 SULPHIDES. Occurs in veins in gneiss, mica slate, hornblende slate, clay slate, granite, porphyry, trachyte, with arsenic, silver, stephan- ite, pyrargyrite, proustite, galena, quartz, calcite, dolomite, baryte, fluor. Is found at Freiberg, Schneeberg, Annaberg, Marienberg and Johan-Georgenstadt in Saxony, Kongsberg in Norway, Joachimsthal and Przibram in Bohemia, Schemnitz and Kremnitz in Hungary, Schwatz in the Tyrol, Wolfach in Baden, Andreasberg in the Harz, Guadalcanal in Spain, Sar dinia, Chalanches near Allemont in Dauphine; the Kolywan mountains m Siberia, Guanaxuato and Zacatecas in IVIexico, Peru, in Cornwall, in cubes and massive in Ilerland, Huel Duchy, in cubes in Huel St. Vincent near Callington, in Huel Basset and Dolcoath. 49. STEOMEYERITE.—Sulphuret of silver and copper; * Phillips. Stromeyerine ; Beudant. Isometrischer Kupfer- Glanz; Mohs. Silberkupferglanz; Hausmann. Stromeyerit; Haidinger. Prismatic. Isomorphous with redruthite. a 100, c ooi, u 102, v 112 twin-plane, to 114. v truncates the edge tom. ue 25° 53' ac 90 0 mm 60 25 wa 77 23 WC 25 44 vc 43 57 me 90 0 UU 51 46 Combination, mtcuac. Twins. 1. Twin-face m. 2. Twin- face v. Fracture conchoidal. Opaque. Lustre metallic. Blackish lead-grey. Streak the same, shining. Perfectly sec- tile. H = 2-5... 3’0. Q = 6’255. Before the blowpipe fuses readily into a grey metallic glo bule, which with fluxes affords the reaction of copper, and by cupellation yields a globule of silver. Partially soluble in nitric acid, leaving sulphur undissolved. Cu’S + AgS, silver, 63’13 ; copper, 31'17; sulphur, 18'70. Analyses of stromeyerite a from Schlangenberg, by Stro- meyer; b from Eudelstadt by Sander; of mixtures of stro- FIO. 147. u' C u