173 
of Zeolite. 
lost 0.75 grains, and became opaque and friable. In a second 
experiment, 10 grains being exposed for 10 minutes to a 
stronger fire, lost 0.95 grains, and consolidated into a hard 
transparent state. 
10 grains of this zeolite, which had not been heated, were 
reduced to a fine powder, and diluted muriatic acid poured 
upon it. On standing some hours, without any application of 
heat, the zeolite entirely dissolved, and some hours after, the 
solution became a jelly : this jelly was evaporated to a dry 
state, and then made red hot. 
Water was repeatedly poured on to this ignited matter till 
nothing more could he extracted from it. This solution was 
gently evaporated to a dry state, and this residuum made 
slightly red hot. It then weighed 3. 15 grains. It was muriate 
of soda. 
The solution of this muriate of soda being tried with solu- 
tions of carbonate of ammonia and oxalic acid, did not afford 
the least precipitate, .which would have happened had the 
zeolite contained any lime, as the muriate of lin* * would not 
have been decomposed by the ignition. 
The remaining matter, from which this muriate of soda had 
been extracted, was repeatedly digested with marine acid, till 
all that was soluble was dissolved. What remained was 
silica, and, after being made red hot, weighed 4.9 grains. 
The muriatic solution, which had been decanted off from 
the silica, was exhaled to a dry state, and the matter left made 
red hot. It was alumina. 
* These names are retained for the present, as being familiar, though, since Mr. 
Davy’s important discovery of the nature of what was called oxymuriatic acid, the 
substances to which they are applied, are known not to be salts, but metallic com- 
pounds analogous to oxides. 
MDCCCXI. 
Z 
