134 ©N THE COMPOSITION OF EEOLITK. 



other places; and Dr. Hutton and Dr. Kenned}' had like- 

 wise detected soda in bodies, to which they gave the name 

 of zeolite, 

 but their iden- There was, however, no rertai ntv, that the subjects of any 



tlTV wuh . - •' ■' 



Uauy's meso ''> these experiments were of the same nature as v/hat Mr, 



type not aicer- Vanquelin had examined, were of that species which Mr. 

 tamed. n .. ,, 



Haiiy CJiils mesotype, 



A specirrrn Mr. Haiiy was so obliging as to send me lately some spe- 



Haijy.^ ^ clm'-ns of mineia's. There happened to be among them a 

 cl lister of zeolite in' rectangular tetrahedral prisms, termi- 

 nated by obtuse tetrahedral pyramids, the faces of which 

 coincided with those of the prism. These crystals were of 

 a considerable size, and perfectly homogeneous, and labelled 

 by himself '■* Mesottfpe pyramidee du depart, du Puy dp 

 Diime," I availed myself of this very fjivovjrable opportu- 

 nity, to ascertain \vhether the mesotype of Mr. Haiiy and 

 natrolite did or did not difrer in their composition, and the 

 results of the experiments have been entirely unfavourable 

 to their separation, as the following account of them wiil 

 show. 

 This zeolite, 10 grains of this zeolite being; kept red hot for five mi- 

 or mesptjrpe, nuteslost 0«75 of a gram, and became opaque and friable. In 



aualysed. • s ' , /. 



a second exj^enrnent, 10 grains, being exposed for 10 mi- 

 nutes to a stronger fire, lost 0*95 of a graiu, and consolidated 

 into a hard transparent state. 



. 10 grams of this zeolite, whicii 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 this ignited matter, till 

 nothing more could be extracted from it. This solution was 

 gently evaporated to a dry state, and this residuum mad^ 

 slightly red hot. It then weiglied 3*15 grains. It was »!«•? 

 rinte of soda. 



The solution of this muriate of soda, being tried with so- 

 lutions of carbonate of ammonia and oxalic acid, did not 

 pifprd the least precipitate, which would have happened 



had 



