Volltext Seite (XML)
FIG. 117. COPPEE. FIG. 118. 129 FIG. 119. Forms and combinations, a, o, d, e, ao, ad, ae, aod, aode, aodk. Twins. Twin-face o. e» = 100° 32' (fig. 118) ; mm = 121° o', mm = 62° 68' (fig. no). No cleavage. Fracture hackly. Opaque. Lustre metallic. Copper-red. Streak the same, bright. In extremely thin films, green by transmitted light. Ductile, ii = 2'5...3'0. a = 8'ff...8'9. Fusible before the blowpipe, colouring the flame green. Soluble in nitric acid; also in ammonia, with access of atmos pheric air, yielding a blue solution. Cu, copper, usually very nearly pure, sometimes with small quantities of iron and other metals. Crystallized, frequently aggregated, so as to produce den dritic, capillary, laminar forms, and massive. Occurs in veins and beds with cuprite, towanite, redruthite, carbonates of copper oxide. Also disseminated in rocks of all formations, rarely in amygdaloidal trap rocks, sometimes in isolated blocks. Is found in beds in porphyry at Moldawa, Saska and Orawitza in the Banat of Teineswar; at Herrn- grund in the county of Sohler; at Schmolnitz and Gcilnitz in the county of Gombr in Hungary ; Nischne-Tagilsk, Bogos- lowsk and Turginsk in Siberia, usually imbedded in granular limestone; in Cornwall in many of the mines near Redruth, the consolidated mines, Wheal Buller near the Lizard in serpen tine ; Mansfeld, Kamsdorf; Chessy near Lyons in France; Spain; Fahlun in Sweden ; Roraas in Norway; Hudson’s Bay; in large blocks to the south of Lake Superior; in Mas sachusetts, Connecticut, New Jersey ; Cuba ; in the Brazils and Chile, often in large masses ; China, Japan ; Rheinbreitbach near Neuwied; Nassau; the mining districts of Saxony; with prehnite in amygdaloidal rocks at Oberstcin, beautifully crys tallized ; with chabasie in Naalsoe, Sandoe, in the Faroe Isles; in Zell, one of the Shetlands, in serpentine, and in Mainland in red sand-stone. Copper crystallizes from fusion in cubes and octahedrons ; occurs in octahedral crystals in artificial avanturine ; is deposited from sulphate of copper on iron and sometimes on wood.