288 METALS. 88. Niccolum. 



88. NICCOLUM. Reddlfh-white, hard, maile- 

 able, attradled by the magnet and itfelf conver- 

 tible into the magnet, fpecific gravity 9,000: 

 fufing with great difficulty, but afTuming a green 

 colour when heated and acquiring a purple tinge 

 if the heat be continued, melting with borax into 

 a glafs of a hyacinth colour: loluble in all acids 

 giving the Iblution a green colpur, and in am- 

 monia to v;hich it gives a bluifh-green colour. 



ochraceum. Green, without luftre, of a common form. 



Ochra cupri nickoli. ^yy?. nat. xii. 3^. 193^ «, 5, 

 Niccolum viride. Wall.fyst. 2, p. 191. «. 2, 

 Nickel ochre. Kiravan miner. 2. p 28-^, 

 Oxvde of Nickel, Schmeifser miner, 2. p, 218. 

 Nickel Gchre, Thomfon chem, 4. p 82. 



Found in Saxony ^ Bohemia^ and SHefia. on the furface of other 

 ores of nickel, in the form of powder or indurated; colour 

 apple-green, rarely grafs-green, dark green or bluifh-green j 

 has an earthy appearance and is very friable: gives an earthy 

 fmell when breathed on, and flightly ftains the fingers: does 

 not melt before the blowpipe, but gives a reddifh or yellowifh 

 tinge to borax : it appears to originate from the decompofi- 

 tion of native nickel ore. 



metallinum. With metalllG luftre, entirely foluble in nitric acid, emit- 

 ting arfenical vapours before the blowpipe. 



Arfenicated nickel. KtrivanmineraL 2. p 28^, 



Oxyde of nickel. Schmei£ef mineral, 2. p. 218. 



Arfeniat of nickel. Thomfon chem- 4. p. 83. 



Found in the mines of Z?(?^^z?z/^?, Saxony^ and the Harz, in irre- 

 gular mall'esand often mixed with fulphate of barytes: colour- 

 pale grey, with o^^ten a mixture of pale green : fratture com- 

 pa<^, partly earthy partly fplintery, with a white ftreak : 

 gives an earthy fmell when breathed on, and adheres ilightly 

 to the tongue ; it contains fome cobalt and alumina, and often 

 fulphate of barytes, befides the arfenic acid. 



sulphuratum With metallic luftre, not quite foluble in nitric acid, 

 emitting arfenical vapours and fulphurous flame and 

 vapours before the blowpipe. 

 Cuprum niccolum. Syit. nat. xii. 3. /. 146. /?. 16. 

 Niccolum ferro et cobalt. Wall. fy(i% 2. p, 189. «, i. 



