MINERAL from GREENLAND. 379 



c. A portion of the black powder being expofed to a red 

 heat for an hour, in an open crucible, became reddifti-brown, 

 and loft fomewhat of its weight. In this altered ftate, it was 

 foluble by means of heat, though with difficulty, both in nitric 

 and fulphuric acids. The folutions had a reddifh-brown co- 

 lour, a flight metallic aftringent tafte, but no fweetnefs. 



f. The folution of this matter in nitric and muriatic acid, 

 when examined by re-agents, exhibited the following pheno- 

 mena : 



(1.) With prufliate of potafh, it threw down a white precipi- 

 tate in flocks. It foon fubfided ; readily diflblved in 

 nitric acid ; the folution was green. 

 (2.) PrulITate of mercury. A light yellow precipitate, fo- 

 luble in nitric acid. 

 (3.) Infufion of nut galls. No change. 

 (4.) Gallic acid. No change. 

 (5.) Oxalate of ammonia. No change. 

 (6.) Tartrate of potafh. No change. 

 (7.) Phofphate of foda. No change. 

 (8.) Hydro-fulphuret of ammonia. Copious black flocks. 



Liquor remains tranfparent. 

 (9.) Arfeniate of potafh. A white precipitate. 

 (10.) Potafh. - - - 1 Copious yellow-coloured 

 (11.) Carbonate of foda. •- > flocks; readily diflblved in 

 (12.) Carbonate of ammonia. J nitric acid. 

 (13.) Succinate of ammonia. A white precipitate. 

 (14.) Benzoate of potafh. A white precipitate. 

 (15.) A plate of zinc being put into the folution in muriatic 

 acid, became black, and threw down a black powder, 

 which was infoluble in fulphuric, nitric, muriatic, ni- 

 tro-muriatic, acetic, and phofphoric acids, in every 



3 B 2 temperature, 



