a New Mineral Species of the Zeolite Family. 289 



is partly dissolved in muriatic acid, giving as a residue a fine- 

 grained powder of silica. From the remaining liquid, the 

 alumina was precipitated by caustic ammonia, and the lime 

 by oxalate of ammonia. The alumina, redissolved in muriat- 

 ic acid, gave a small additional quantity of silica. The oxa- 

 late of lime was ignited, then carbonate of ammonia added to 

 it, and again dried, to transform it into carbonate of lime, 

 which was weighed. The remaining fluid was evaporated, 

 the residue redissolved in water, by which another small quan- 

 tity of silica was separated, and the solution allowed to crys- 

 tallize. Very distinct cubes formed, which appeared to be 

 crystals of muriate of soda, as they did not deliquesce, nor 

 did they produce a precipitate, either when dissolved in alco- 

 hol, and added to a solution of muriate of platinum in alco- 

 hol, or when dissolved in water, and added to a solution of 

 tartaric acid in water. 



The quantity of water given above is the mean of two ex- 

 periments, which gave separately 14.72, and 14.25. 



From another analysis of the epistilbite, I obtained the fol- 

 lowing result : — 



Silica, - - 60.28 containing oxygen 31.31 



Alumina, - 17.36 8.11 



Lime, ... 8.32 2.31. 



Loss, calculated as Water, - 12.52 11.34 



There is less water, and more silica in it, than the quanti- 

 ty required by the formula. This was caused by the cir- 

 cumstance, that, in order to render the mineral more easily 

 acted upon by muriatic acid, I had ground it down to an im- 

 palpable powder, which was suspended in water, and then al- 

 lowed to subside, by which means only the most minute par- 

 ticles are separated. In drying it on the stove, the heat be- 

 came a little too great, so as to drive off a small quantity of 

 the water, and to render part of the mineral insoluble, which 

 therefore increased the apparent quantity of the silica. But 

 I have mentioned this analysis, because I have conducted it 

 with as much exactness as I could command ; and, because, 

 at least the relative quantity of alumina, lime, and soda, is 

 correctly determined. 



VOL. IV. NO. II. apkii, 1826. T 



