MINERAL from GREENLAND. 399 
was A portion of the black powder being expofed to a red 
_heat for an hour, in an open crucible, became reddifh-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 {ulphuric acids. The folutions had a reddifh-brown co- 
lour, a flight metallic aftringent tafte, but no fweetnefs. 
f. Tue folution of this matter in nitric and muriatic acid, 
when examined by re-agents, exhibited the following pheno- 
mena : 
(1.) With pruffiate of potath, it threw down a white precipi- 
tate in flocks. It foon fubfided ; readily diffolved in 
nitric acid ; the folution was green. 
(2.) Pruffiate of mercury. A light yellow precipitate, fo- 
luble im 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 tran{parent. 
(9.) Arfeniate of potath. A white precipitate. 
(1o.) Potath. - - - Copious yellow-coloured 
(11.) Carbonate of foda. - - piene 3 readily yee in 
(12.) Carbonate of ammonia. nitric acid. 
(13.) Succinate of ammonia. A white precipitate. 
(14.) Benzoate of potath. . 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 B2 - temperature, 
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