192 ANALYSIS OF THE NATROLITEi 



with minute d. In a charcoal crucible the mineral afforded the fame 



fn'the^urface. P^'^dud. The glafs pearl exhibited on its furface minute glo- 

 bules of iron. 



B. 

 Diflblved in a. 100 grains of finely levigated natrolite, were mixed into 



muriatic acid. ^ p^^^ ^^^^ ^j^l^ ^^^^^g,.^ p^^^ Ji^^q ^ ^^,^^ ^^^ digefted in mo- 

 derately ftrong muriatic acid. The folution was foon effe6led, 

 and it exhibited a reddidi yellow gelatinous mafs. After di- 

 The filiceous luti4ig it copioufly with water, and continuing the digeftion, 

 cipitated by ^^^^ filiceous earth feparated, which, being coUefted and 

 water, dried, weighed 4-8 grains. 



cubic cryftals b. The fluid obtained in the laft procefs on evaporation, 



were obtained, ^^ielded cubic cryftals. The remaining fluid being further 

 The dry mafs evaporated to drynefs, the dry mafs was pulverifed, and di- 

 digefted in al. gefted with a gentle heat in alcohol. Having fuffered the al- 

 coholic folution to cool, a white faline powder wasdepofited ; 

 the alcohol was therefore decanted, and the powder colle61ed, 

 wallied in fpirit, and dried. The remaining alcoholic folution 

 was afrefli evaporated, a fmali quantity of the fame faline 

 powder became feparated, which was added to that obtained 

 before. 

 Therefiduum c. The refidue of the procefs b infoluble in alcohol, was 



ter"and "^ ^^' ^liffolved in water. On adding to this folution liquid ammonia^ 

 precipitated by a light flocculent precipitate became depofited. This being 

 ammonia. feparated by the filtre, the fluid which paffed through, was 



evaporated by a gentle heat. The fait obtained, weighed when 

 perfe611y dry, 31 1 grains. 

 The folution in d. The alcoholic folution b (which from other experiments, 

 alcohol decern- ^^^^ known already to contain nothing but alumine and oxide 

 monia. of iron) after being diluted with water, was decompofed by 



liquid ammonia, and the precipitate colleded and dried. 

 The fluid, from which this precipitate had been feparated, 

 was evaporated, and the mafs ftrongly heated, fo as to vola- 

 tilize the muriate of ammonia that had been formed, when 

 there remained two grains of fait, which being diflblved in 

 water, yielded cubical cryftals. 

 Tbe precipitates e. The precipitate obtained by means of liquid ammonia d, 

 tion'o? 'otafl!"' tog'^^'^^'^ with that before produced c, were put into a folu- 

 tion oF pot-adi, and digefted with that fluid. A folution was 

 effeded, and oxide of iron feparated, which, after being ig- 

 . nited, weighed 1|- grains. 



f. Th« 



