Zinc. 321 



quently mixed with filver, arfenic, and other 

 metals. 100 Parts of that of Danemora, 

 Examined by Mr. Bergman, exhibited 45 of 

 zinc, i of regulus of arfenic, 9 of iron, 6 of 

 lead, all flightly dephlogifticated, 29 of ful- 

 jphur* 6 of water, and 4 of filex. 2 Bergm* 332. 



it 8. This ore he analyfed in the moift way 

 after the following manner, firft, by diftil- 

 lation he obtained the water, regulus of arfe- 

 nicj and part of the fulphur ; the refiduum 

 he boiled in marine acid, until all that was 

 foluble was taken up. To the folution, after 

 its filtration and forxie evaporation, he added 

 vitriolic ammoniac, by whofe decompofition 

 vitriol of lead was precipitated in fome mea- 

 fure, and the remainder of it by further eva- 

 poration. This being feparated, the remainder 

 was evaporated to drynels, and treated with 

 nitrous acid, and at laft, calcined to dephlo- 

 gifticate the iron ; the calx of zinc only, was 

 then diffolved in the nitrous acid, and preci* 

 pitated by the PntJJian alkali. 



III. VARIETY. 



Red, or Reddijh Brown. Rod S/ag of the 

 Swedes. 



19. Its texture is generally fcaly, fome- 

 times cryftalized, and femitranfparent, it 



Y gives 



