METALS. 84. Cuprum. 



259 



'84. CUL RUM. Fine red eafily tarnifhing in the 



air, hard and tenacious, malleable and dudlile, 



Ibnorous and elaftic, Ipecific gravity 8,667: 



melcing with difficulty, and when expofed to a 



red heat taking fire and emitting a mod brilliant 



crreen light; exploding violendy when melted 



^ind cafl-' into water: loluble in mod acids and 



ammonia, exhibiung a blue colour; from its 



Iblution in n:tric acid precipitating a blue oxyde 



by the a.ddidon of potafs: tinging glafs green.- ^ 



Cof;per. 



ttati<vum, Uncoinbined. 



Cuprum nudum. Syfr. nat, xii. 3. p. 145, «. 2. 

 Cuprum nativura. IValLfyfi. z p. 274. ». !• 

 Native copper. Kirivan ?niner. l. p. 12^, 

 Native copper. Sckmeijjer mineral, z. p. 126. 

 Native copper. Thomjln chem. \ p^ 37. 



2. Precipitated by a vitriolic folution. 



Cuprum prsccipitatum. ^j^, a<2/. xii, 3./. 178. n, 3» 

 PrascipicKted copper. Kit'-wan tniner. z. p% 128, 



3. Cryftallized ip 8 Tided figures. 



Cuprum cryftaliiratum. Syst. nat. xii. 3. ^. 1^3. ». j. 

 Gmel/yP nat. 3. p. 446. tab. l-fg* 23. 

 Soiverby JJrit miner, tab. 17. 25. 



Found in Cornivall^ Jnglefea., JVicklc^v ijn Ireland^ on the fliores 

 of the Copper ijland wt^x Kamtfchatkny in Iceland znd. the Feroe 

 ijland y Hung.jry, Siberia ^ Sxveden^ NornAjay^ Jitid many parts 

 of the old and new world i in compadl mafe, plates, thread?, 

 and. arboiefcent and botryoidal figures of various forms; 

 fometimes cryilallized in cubes or double 4-fiied pyramids: 

 texture fomer mes granulated., rarely lamellar: fuperficial 

 coiour when tarnifhed greeniih-yeilow, or reddifh with a 

 pale green, bluifh or variegated : \vhen hard and compadl it 

 takes a fine polifh, and exhibits a rich metallic luftre, but 

 fooR tarnifhes by the adion of the air and contracts a green- 

 ifn ruil called verdfgris; fpecific gravity from 7,600 to 

 8,667. 



hteritium. Red, fofr, >viiho\jt metallic luftre. 



Ochra cu^pri. Byft. ««^ xii. 3.^, 193. n. 6, 

 Cuprum corrofum. WalL./yH, 2. /, 290. n, 16^ 

 Earty red ore. Kir-wan mineral. 2. p. v>^'^\ 



K k 2 



»■ 



