362 Mr A. Connell's Analysis ofGmelinite or Hydrolite. 



{b) From the aqueous solution of the muriates of the bases, 

 ammonia threw down a precipitate which, after ignition, weighed 

 2.85 grains. When this was dissolved in muriatic acid .09 of 

 silica remained undissolved, and by boiling the solution with 

 excess of caustic potash, .02 of oxide of iron, containing a little 

 lime, were obtained ; thus leaving 2.74 grains of alumina. 



(c) By means of oxalate of ammonia and moderate calcina- 

 tion of the precipitate, 1.82 of carbonate of lime were obtained, 

 equivalent to 1.025 of lime. 



(d) The remaining solution yielded, by evaporation and ig- 

 nition, a residue of 1.42, which, when dissolved in water, left 

 .03 of silica, and yielded cubical crystals by evaporation ; and 

 when redissolved, a precipitate was obtained with muriate 

 of platinum, and by evaporation, abundance of crystals of the 

 double chloride of sodium and platinum. These last were 

 taken up by heated spirit of wine, leaving .36 of the double po- 

 tassium salt, equivalent to .069 of potash and .109 of chloride 

 of potassium. There thus remained 1.281 of chloride of so- 

 dium, equivalent to .682 of soda. 



In 17.67 grains of the mineral, there are thus contained, ex- 

 clusive of water, 



Silica (a b and d) 8.581 



Alumina {a b) 3.19 



Lime (a c) . 1.084 



Soda (d) . .682 



Potash (d) . .069 



Oxide of Iron (i) .02 



13.626 

 To determine the quantity of water, a portion of the crys- 

 tals was ignited in a platinum crucible and charcoal fire, when 

 he loss of weight amounted to 21. C6 per cent. 

 We have thus, in 100 parts of the mineral : 



98.75 



