Salts* 195 



ftatotnchium^ Trichites, or native alum 

 mixed with vitriol of cobalt, is found in a 

 capillary form in mines of gold, filver* and 

 mercury, in Hungary and Germany. 2 Lin. 

 *uon. Gmelin 316. the phlogifticated alkali, 

 precipitates the cobalt which with borax 

 gives an azure glafs. 2 Bergm. 455* 



SPECIESXIL 



Vitrio] of Nickel. 



This is alfo difficultly foluble in Water ; 

 both it and its folution are of a green colour ; 

 it is found native efflorefceing on Kupfernickel 

 and generally mixed with vitriol of iron ; I 

 Mem. Sued. 213. Cronft. 123. zinc precipi- 

 tates the nickel, but not the irori. 



SPECIES XIII. 



Vitriol of Manganefe. 



I do not know that this has been as yet 

 found ; as its colour and alfo that of its pre- 

 cipitate by fixed alkalis, is white, it may be 

 confounded with vitriol of zinc; but the pre- 

 cipitate of the vitriol of manganefe foon grows 

 black by expofure to the air, efpecially if 

 heated, and is then infbluble in the dephlo- 

 gifticated nitrous acid, unlefs fugar be added, 

 properties which the precipitate of zinc does 

 not poflefs. 



O 2 SPECIES XIV. 



