ORDER viii. OCTAHEDRAL COPPER* ORE. 283 



ore. Red Copper-Ore itself, the remaining varieties of the 

 present species, was divided into three subspecies, the fo- 

 liated, which contains those crystallised varieties which are 

 not capillary, and compound cleavable ones ; the capillary, 

 which comprehends very thin filiform crystals, reticulated 

 or in velvety groupes ; and the compact, which refers to im- 

 palpable compositions, and is to the foliated varieties in the 

 same relation as compact limestone is to calcareous spar, or 

 compact Lead-glance to common Lead-glance. 



2. Octahedral Copper-ore consists of 



Copper 91-00 80-50. 



Oxigen 9-00 KLAPROTH. 11-50. CHENXEVIX. 

 It is the protoxide of copper, Cu, which contains 88-78 cop- 

 per and 11-22 oxygen. In the reducing flame of the blow- 

 pipe, it is reduced upon charcoal into a globule of copper. 

 It is soluble with effervescence in nitric acid, but without 

 effervescence in muriatic acid. 



3. Octahedral Copper-ore is found in beds and veins in 

 several rocks. It is accompanied by various other ores of 

 copper and iron, and rhombohedral Quartz. 



4. Very fine varieties of this species have been found in 

 the Bannat of Temeswar, particularly the vicinity of Mol- 

 dawa ; near Catharineburgh in Siberia, at Chessy near 

 Lyons in France ; and these occur in beds, at least those 

 of France, in sandstone, and those of Hungary in gneiss. 

 Not inferior to any of the preceding ones, and in consider- 

 able quantity, the present species is met with in the well 

 known tin and copper veins of Cornwall. The chief locali- 

 ties of capillary groupes are Cornwall and Rheinbreitbach on 

 the Rhine. Octahedral Copper-ore also occurs in Saxony, 

 in the district of Siegen in Prussia, in Norway, in Peru 

 and Chili. Tile-ore is found among others in the Bannat, 

 and at Camsdorf and Saalfeld in Thuringia. It is frequent- 

 ly produced in the slags formed in the last process of melting 

 copper, as has been observed by Professor MITSCHERLICH. 

 Copper vessels and other objects made of that metal, and 

 long exposed to the action of the weather, are, to a great 



