METALS. 89. Zincum. 289 



Sulphurated nickel. Kir^wan mineral z, p. 286, 



Native nickel. SchmeiJJer miner, 2. p 216, 



Kupfer-nickel. Ihomfon cheni 4. ^, 81, 



Found at Hriego in CornnvalU in Stheria, S-tvedent Saxony y Hun- 

 gary, Bohemia, &c. maflive or difleminated, never cryftal- 

 lized, in a m;itrix of calcarecus or heavy fpar, and often 

 coated with nickel ochre: colour coppefy-red with variations 

 of reddifh white or grey : texture compatl, conchoidal, foli- 

 ated, or ftriated, with often curved lamellar concentric cotl- 

 cretions: before the blowpipe it exhales an arfeni A Imell, 

 and melts into a bead which gradually darkens by expofure to 

 the air: fpecific gravity 6,608. to 6.648' it frequently con- 

 tains bifmuth, cobalt and iron, but always a portion of 

 pyrites. 



89, ZINCUM. Brilliant white with a fhade of blue, 

 hardifh, a little malleable but not du6lile, /light- 

 ly fonorous, of a fibrous or fcaly texture, fpeci- 

 fic gravity 7,120: burning with a brilliant white 

 flame when heated to a ftrong degree, and emit- 

 ting light white flakes, when fuled with copper 

 giving it a brady-ycllow colour: eafily foluble 

 in acids, imparting no colour to tiie fbiudon, 

 but depriving it of its acrimony. 



ocbracEum* Powdery, white, without luftre, 



Ochra zinci. Syft nat, xii. 3. p. 193. 



Zincum pulverulentum. Wall.Jyii. 2. p. 222. «. 8, 



Loofe or triable zi ic. Kiriman mineral .2 p. 233. 



Found in China, Snjueden, and Cannthia, in a loofe and friable 

 form, and fometimes effervelce-^ with acids. In China it is 

 u fed -in the formation of the metal called Tutenag* 



calciforfret Compact, very foft, opake, white, without luftre. 



Minerd zinci. C^onft min. 226. i. i. i. I 



Found near Workjhjjorth, in ^iberia^ Snveden, Boh mta, Aujlrla^ 

 Sec. of an cart-iy or minutely lamellar torm in ernaily, fome- 

 times cellular, nodular, fillular, or varioufly imitative : co- 

 lour white, fomei mes verging to yellow or grev : it effer- 

 vefces with acids, in which it is aimoll totally djlfolved. 



*v:treum. Hard, tranfparent, of a glafTy luftre. 



Carbonate of Zinc. Schme/ser miner. 2. /. 195. 



VOL. Vil. — O 



