SALTS. 72. Vitriolum. 22j 



72. VITRIOLUM. Of a very cauftic tafte: its 

 watery fokition made turbid both by foda and 

 prufTiate of lime: very foft, mouldering in the 

 air: dilTolving Hke water when expofed to heat, 

 and in a very ftrong degree leaving a genuine 

 metallic oxyde. 



magnesii. Of a rofy*red colour, its watery folution depofuing an 

 ochraceous fediment when dilFolved foda is poured 

 into it, and a greenifh one when a folution of prufliate 

 of lime is poured into it. 



Sulphate of Cobalt. ScJ?meiJfer miner. 1,^.274. 



Sulphat of Cobalt. Thomfon chem. 'i,. p. lOi. 



Found in the mines of JV^a/o^/ in /An^flry; it is foluble in 16 

 times its weight of cold water, and melts with borax into a 

 blue glafs : when cryft^illized it exhibits an elongated 8-fided 

 prifm. 



Niccoli. Green, its watery folution depofiting a whitifli-green fedi- 

 ment from a mixture of foda. 



Vitriol, ferr et niccol, Cronjt. min, 123. 2, 4. 



Sulphate of nickel. SchmeiJJer mineral. \, p. 275, 



Sulphat of nickel. Thomf, chem. 3. p. 61. 



Found in fome mines of S^weden^ and ufually contains fome 

 iron : colour a deep green : it cryllallizes in double 4-fided 

 pyramids with their tips truncated, aiidfometimes in large 4- 

 fided equal prifms. 



Zinc:, White, its watery folution depofiting a white fediment 



from a mixture of foda or prufliate of lime, and when 

 evaporated cryftallizing into 4-fided prifms terminated 

 at both ends by a pyramid. 



Vitriolum album. Syji. nat. xii, 3. p* 104. «. 3- 



Vitriolum zinci. Wall fyst. 2, />. 24. «. 3. 



White Vitriol. Berkenb, outl. p.i^:,^ 



Vitriol of zinc. Kirmuan mineral. 2. ^. 23. 



Native vitriol of zink. Schmeifser mineral. 1.^.274. 



Sulphat of zinc. Thomfon chem. "t^. p. 66. 



Found in the copper mines o( Cornivall znd dnglefea, and in the 

 zinc-mines of S<zveclen, Bohemia, Germany, and Hungary ; 

 rarely in its perfefl native ftatc, but generally in a ftalafti- 

 tical or capillary ftate, or in a loofe powdery efflorefcencc : 

 it is fometimes blended with a little iron, and then tin(^ure 

 of galls turns its folution blackifh : the cryftals are foluble in 

 lomething more than twice their weight in water, and efflo* 



