Prof. Berzelius on two newly discovered Mineral Species. 331 



D. The precipitate obtained in C by ammonia was partly 

 soluble in dilate sulphuric acid. A substance remained un- 

 dissolved, which turned pale yellow on being exposed to a red 

 heat. 



E. The solution in sulphuric acid, (D) and the water of 

 edulcoration, were nearly neutralized with ammonia, and 

 while boiling hot, sulphate of potash was dissolved in them, as 

 long as any precipitate formed. The precipitate washed, first 

 with pure water, and then with ammoniacal water, and then 

 exposed to a red heat, became yellow. It was now melted, 

 along with the substance obtained in D, and a little sulphate 

 of potash with excess of acid, and digested in water, which be- 

 came but slightly nebulous by ammonia. It was placed upon 

 a filter, and washed first with tartaric acid, and then with con- 

 centrated muriatic acid, as the whole of it had not been dis- 

 solved by the former. What had remained undissolved, even 

 in the latter, proved to be titanic acid. From the solutions in 

 the tartaric and muriatic acids, nothing was pi'ecipitated when 

 ammonia was added in excess. Sulphuret of iron was preci- 

 pitated by hydro- sulphuret of ammonia, and afterwards it 

 was converted into oxide of iron. The remaining fluid was 

 evaporated to dryness, and the salts decomposed by a red 

 heat. A white earthy substance was thus obtained, insoluble 

 in muriatic acid, but soluble in concentrated sulphuric acid, 

 and in every respect similar to zirconia. This substance, how- 

 ever, still contained a little titanic acid, as also the titanic acid 

 obtained above a little zirconia. 



F. The fluid, which in E had been precipitated by means 

 of sulphate of potash, was now mixed with tartaric acid, su- 

 persaturated with ammonia, and precipitated by hydro-sul- 

 phuret of ammonia. The sulphuret of iron thus obtained 

 was transformed into oxide, the remaining saline mass was 

 evaporated, and then exposed to a red heat, along with an ad- 

 dition of saltpetre to prevent the formation of sulphurets. 

 The salts, with an excess of alkali, were dissolved in water, 

 and the remaining earthy substance was soluble in muriatic 

 acid in the cold. With caustic ammonia the fluid gave a pre- 

 cipitate, which became yellowish brown upon the filter, and 

 black on being exposed to heat. The ammoniacal fluid yields 



