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160 SULPHIDES. flame; in the outer flame melts easily with effervescence ■ in the inner flame becomes solid. With soda yields a globule of copper. Is completely decomposed by warm nitric acid, yielding a blue solution, and leaving a residue of sulphur. Cu ! S, copper 79'84, sulphur 20-16. Analyses of redruthite a from the Gumeschefskoi mine, near Katharinenburg, by Klaproth; b from Siegen, by U11- mann; c from the United mines in Cornwall, by Thomson; d from Byglands Grube, e from Stromsheien in Norway, both by Scheerer; /from San Pedro in Chile, by Domeyko a b c d e f Copper . . 78-60 79-60 77'16 77‘76 79’12 76‘61 Iron . . 2'25 0"75 1'45 0’91 0'28 0'74 Sulphur . . 18*60 19’00 20'62 20'43 20'36 20'79 Silica . . 0-75 1-00 — _ su ver 2 -96 In crystals, attached singly, or collected in druses; usually massive and disseminated. Occurs in beds and veins with bomite, pyrite, chrysocolla, malachite, chessylite, quartz. Is found near Freiberg in veins • in Mansfeld and Hessia disseminated in beds in bituminous' copper slate; in Siegen in veins of iron stone; at Kupferberg and Kudelstadt in Silesia, Moschellandsberg, at Lauterberg in the Harz, in Sweden, Norway, Siberia, the Banat of Temeswar, North America, Peru, Guanaxuato in Mexico. Crystallized and massive in veins in clay slate in several mines near Bedruth and the Land’s End in Cornwall, at Mid dleton Tyas in Yorkshire; in veins at Fassney Bum in East Lothian, and in Ayrshire in Scotland, in Fair Isle between the Orkney and Shetland Isles. By fusing copper glance, or a mixture of copper and sulphur in the same proportions, 4a can be obtained in octahedral crys tals, and is consequently dimorphous. The characters of Breithaupt’s digenite appear to be the same as those of redmthite, except that o = 4-608...4-680. Ac cording to a quantitative blowpipe analysis by Plattner, it con sists of—copper 70-20, silver 0'2l, sulphur 29-60. It occurs massive, and investing other minerals with crystal lized redruthite, at Sangerhausen, and with cuproplumbite in Chile. COVELLINE. — Covelline ; Beudant. Kupferindig Mohs, Hausmann. Covellin; Haidinger.