94 COPPER -BLACK. 



Sulphuric acid . . . 39'60 

 Peroxide of iron . . . 26'11 

 Alumina . . . . 1'95 

 Magnesia .... 2"64: 



Silica 1"37 



Water 29-67 



101-34 



Locality. Incrusting Coquimbite in the 

 district of Copiapo, in Chili. 



Copper-black, Jameson. See Black 

 Copper. 



copperdiaspore. see kupferdiaspore. 



Copper Emerald, Jameson. See Diop- 



TASE. 



Copper Froth, Dava. See Tyrolite. 



Copper Gi>ance, Jameson. Ehombic : 

 Occurs crystallized in regular six - sided 

 prisms, mostly modified on the terminal 

 edges, sometimes on the lateral ; and in 

 acute and obtuse dduble six-sided pyramids, 

 with triangular planes; massive, and occa- 

 sionally in pseudomorphous crystals. Colour 

 and streak blackish lead-grey, often tar- 

 nished black, and occasionally iridescent. 

 Lustre metallic. Structure perfectly lamel- 

 lar, sometimes sectile and soft. Fracture 

 conchoidal. Slightly malleable, and much 

 more easily fusible than copper. H. 2*5 to 3. 

 S.G. 5-5 to 5-8. See >Jail-headed Coppek- 



ORE, 



Fig. 128. 



Fig. 129. 



Fig. 130. 



Comp. Disulphide of copper or -G-u S = 

 sulphur 20, copper 80 = 100. 



Analysis from the United Mines of Corn- 

 wall, by Thomson : 



Copper 77-16 



Sul{)hur .... 20-62 

 Iron 1-45 



99-23 

 BB on charcoal melts very easily after 

 the sulphur is driven off, and yields a glo- 

 bule of copper covered with a blackish 

 scoria. Forms a blue solution in ammonia. 

 Found in Cornwall, the finest specimens 

 in the neighbourhood of St. Just; also in 

 Ayrshire ; in the porphyritic district of Bar- 

 rack Mountain, in Ulster, and massive at 

 Kenmare Mines, Kerry. The compact and 

 massive varieties occur in Siberia, Hessia, 

 Saxony, and the Bannat, and at the mines 

 near Angina, in Tuscany. 



Copper Glance is met with in veins and 



COPPER NICKEL, 

 beds accompanied b}' other ores of copper, 

 and is highly prized by the miner; but it 

 is rather a scarce ore of copper, and does not 

 occur in very gre;it abundance, although it 

 is found in many different places. 



It may be distinguished from Red Silver- 

 ore (Pyrargyrite) by the colour of its streak, 

 v-hich resembles that of the mineral, while 

 the streak of Pyrargyrite is a fine cochineal- 

 red. From Silver Glance it may be distin- 

 guished b}' many characters, especially by 

 its inferior tenacity; from Bournonite and 

 Grey Copper by its comportment before the 

 blow-pipe, and the green solution it affords 

 Avith nitric acid. Copper Glance is sectile, 

 but Grey Copper is brittle. 



Brit. xMus., Case 7. 



31. P. G Principal Floor, Wall-cases 2 

 and 7 (British); 17 (Foreign). 



Copper Green, Jameson. See Chryso- 



COLLA. 



Copper Mica, Jameson. See Chalco- 



PHYLLITE. 



Copper Nickel, Allan, Jameson. Hexa- 

 gonal, and isomorphous with Breithauptite. 

 It rarely occurs crystallized, but reticulated, 

 dendritic, and botryoidal ; most commonly 

 massive. Colour copper-red, acquiring a 

 grey or blackish tarnish by exposure. Lus- 

 ti'e metallic. Streak pale brownish-black. 

 Emits an arsenical odour when struck with 

 steel. Yields to the knife with difficulty, 

 and is brittle. Fracture imperfect conchoidal, 

 or fine-grained uneven. H. 6 to 5-5. S.G. 

 6-6 to 7'-6. 



Comp. Di-arsenide of nickel or Ni^, As = 

 nickel 44-1, arsenic 65-9 = 100; with small 

 quantities of Sb, Co, Pb, Fe, and S. 



Analysis from Balen, in the Pyrenees, by 

 Berthier : 



Nickel ..... 33-67 



Iron 143 



Antimony .... 28-37 

 Arsenic . . . . 33-67 



Sulphur . . . .2-86 



100-00 

 BB on charcoal emits strong arsenical 

 fumes, and fuses to a silver-white, brittle 

 globule. 



Soluble in nitric acid, with separation of 

 arsenious acid ; more readily in nitro-muri- 

 atic acid. 



Copper Nickel generally accompanies 

 ores of cobalt, bismuth, silver, and copper. 

 It is found in Cornwall, at Pengelly Mine, 

 St. Teath ; at Huel Chance, St. Austell, and 

 at Fowey Consols Mine; also in Norwa}' 

 and Sweden ; Koliwan, in Siberia ; Andreas- 

 berg, in the Harz ; Schneeberg, Annaberg, 



