NICKEL ORES. 269 



copper nickel.— Arsenica Nickel. 



Hexagonal. Usually massive. Color pale copper-red ; 

 streak pale brownish-red. Luster metallic. Brittle. H = 

 5—5-5. Gr=7-3— 7-7. 



Composition : nickel 44, and arsenic 56 ; sometimes part 

 of the arsenic is replaced by antimony. Gives off arsenical 

 (alliaceous) fumes before the blowpipe, and fuses to a pale 

 globule, which darkens on exposure. Assumes a green 

 coating in nitric acid, and is dissolved in aqua-regia. 



Dif. Distinguished from iron and cobalt pyrites by its 

 pale reddish shade of color; also from the former by its 

 arsenical fumes, and from the latter by not giving a blue 

 color with borax. None of the ores of silver with a metallic 

 luster have a pale color, excepting native silver itself. 



Obs. Accompanies cobalt, silver, and copper ores in the 

 mines of Saxony, and other parts of Europe ; also sparingly 

 in Cornwall. 



It is found at Chatham, Conn., in gneiss, associated with 

 white nickel or chloanthite. 



clo anthite . — White Nickel. 



Monometric. In cubes. Color tin-white. Streak grayish- 

 black. H*=5-5— 6. Gr=6-4— 67. 



Composition : nickel 28*40, arsenic 7034, (from Kams- 

 dorf.) Often contains cobalt, and graduates into smaltine. 



It also sometimes contains iron, and this variety is the 

 safflorite of Haidinger, or chathamite of Shepard. The ore 

 from Chatham, Conn., affords 10 to 12 per cent, of nickel, 

 1 to 3 of cobalt, and 12 to 18 of iron. 



Found usually with smaltine at its various localities. 



Nickel glance is another arsenical ore, occurring in cubes and massive- 

 Color silver- white to steel-gray. Contains 28 to 30 per cent, of nickel 

 with arsenic and sulphur. H=5'5. Gr=»6 1. From Helsingland, in 

 Sweden, and also in the Hartz. Also at Schladming, in Austria, con- 

 taining 38 per cent, of nickel, and having the specific gravity 66 — 6'9. 

 This ore has been called Gersdorffite. 



Nickel Stibine. An antimonial sulphuret, called sometimes Nickel' 

 iferous antimony ore, containing 25 to 28 per cent, of nickel. Color 

 Bteel-grayj inclining to silver-white. In cubical crystals and also 

 massive. H=5 — 5*5. Gr*=6'45. From the Duchy of Nassau. 



What is the crystallization and appearance of copper nickel? of whal 

 does it consist 1 How is it distinguished from iron and cobalt pyrites 

 how from silver ores 1 Where does it occur 1 



