Volltext Seite (XML)
128 COPPER. The fracture is small and imperfect conchoidal. It is semi-hard. It is brittle. It is easily frangible, It is heavy. Specific gravity, 4.842, 4.893, UUmann. Chemical Characters. Before the blowpipe, it decrepitates, and then melts into a black cupreous bead, giving out a white antimo- nial vapour. ■ Constituent Parts. Poratsch Anna-1 Zilla in St Wenzel Kapnik in Tran- in Hun- berg id Claus- near Wolf- Peru. sylvania. gary. Saxony, thal ach. Copper, 37.75 39.00 40.25 37.50 25.50 27.00 Antimony, 22.00 19.50 saoo 29.00 27.00 23.50 Sulphur, 28.00 26.00 18.50 21.50 25.50 27.75 Silver, 0.25 - 0.30 3.00 ia25 10.25 ' Iron, 3.25 7.50 iaso 6.50 Lead, m Arsenic, - _ 0.75 • 1.75 Zinc, 5.00 Mercury, - 6.25 Loss, a 75 1.75 3.70 2.50 1.75 2.75 100.00 100.00 100.00 100.00 100.00 100.00 Klaproth, Beit. b. iv. s. 56. 68. 73. &, 80. From these analyses, it appears, that the essential component parts of Black Copper are, Copper, Antimony, Iron, and Sulphur, and that the SU- ver, Lead, Zinc, and Mercury, are only accidentally mixed. Geognostic