*S 



ANALYSIS OF A NEWLY -DISCOVERED MINERAL 



foluble in ful 

 phuric acid 



tained was of a white colour. After being collected on a 

 filtre, warned, and dried, its weight amounted to .56 grains. 

 On diflblving it in fulphuric acid, and adding a minute quan- 

 tity of* potafli, pure acidulous fulphate of alumine and potaih 

 was obtained. It was therefore pure alumine. 

 The precipitate j-j. True refidue marked (X F) was now thoroughly dry, 

 potato and wafli- anc * of a contiderable hardnefs. Its colour was a glittering 

 eJ, was partly reddiih brown. It was reduced to powder, and digefted in 

 liquid ammonia. This alkali, however, after having being 

 examined, had taken up nothing. Concentrated fulphuric 

 acid being prefented to a fmall quantity of it, had likewife 

 no effect upon it. It was therefore mixed with a fmall 

 quantity of drv potafli, and ignited for fome time ; then 

 uilfolved in diftillcd water, and transferred upon a filtre. 

 The refidue wag repeatedly waflied. After being confider- 

 ably dry, it was put into a glafs evaporating bafon, pure ful- 

 . phuric acid was .poured over it, diluted with a little water, 

 -and the whole carefully evaporated to drynefs. On being 

 fufoed to cool, and diftilled water being added, part of it. 

 became diflblvcd, and another part remained inlbluble in 

 the form of a brownilh powder, which was collected on a 

 fibre. 



I. This fulphuric folution (H) was of a grcenifli hue; its 

 tafte was atrringent. PruiTiate of potafli threw down pruffiate 

 of iron. Tinware of galls produced a black precipitate with 

 it. Liquid ammonia occafioned a reddifli brown precipitate, 

 which, after being warned, dried, and ignited, weighed 

 twelve grains. It was an oxide of iron. It was aflayed with 

 fuper-fat mated borate of foda by means of the blow-pipe, for 

 inveltigating the pretence of manganefc, but no veftige of 

 this metal could be difcovered. 



• K. The product obtained by means of fulphuric acid (H), 

 •was mixed with three times its own weight of carbonate of 

 nateof potafh) apotafl}, and boiled m a futlicient quantity of diftilled water, 

 £2*!**°* A lj & ht ea,th 7 iubftance became feparated, tinged flightlv 

 yellow, by an admixture of ferruginous matter. Being dif- 

 pofed to believe that this earthy fubftance might be zircone, 

 tt was merely collected on a filtre and waflied, but not ignited, 

 its weight was Iwenly-hve grains. It would, if it had been 

 ignited, probably weighed only twenty grains. This earth 

 «Wfc mfolublein potaih, but foluble in nitric and acetic acid. 

 • *- ■— United 



The' folution 

 contained iron* 



The fulphuric 

 folution, H. 

 gave (by carbo- 



