S64 Mr Connell's A^ialysis of several Species of 



some of the more recent analyses, as that of Fahlunite by the 

 same eminent analyst *. 



Our attention, however, at present, more immediately con- 

 cerns the composition of Chabasite. With respect to this mine- 

 ral, Berzelius makes the following statement in the observations 

 which he has prefixed to his general collection of mineral for- 

 mulae^ — *!• 



" The Chabasite consists, according to the earlier analysis, of 



C a^ Si + 3 AZ S^ -I- 18 H a little of the lime being replaced 

 by potassa. More lately I have analysed a chabasite sent me 

 from Scotland under the name of Levyine, in which a little of 

 the lime was replaced by potassa and soda. M. Ardfwedson has 

 analysed a chabasite from Scotland, in which all the lime was ex- 

 changed for potassa and soda. It is thus clear that there are 

 chabasites which contain lime principally, and others which con- 

 tain soda principally, and that in all the bases, lime, potassa and 

 soda, can replace one another in indeterminate proportions ; so 

 that thus the chabasites, from different localities, may be differ- 

 ently composed without losing the general formula." In ano- 

 ther paper J, Berzelius has brought together the following ana- 

 lyses of this mineral from different localities. 



F£RROe||. Scotland §. Gustafsberg ^. 



98.86 99.99 99.48 



In the same paper he has also given an analysis of Levyine 

 which he there considers as a chabasite ; but from the explana- 

 tion afterwards given by Dr Brewster **j who sent to him the spe- 



• Poggendorf 's Annalen, xiiL 70. 



'\ See Poggendorf's Annal. xii. 4. 



X An. de Chemie, et de Phys. xxxi. 



I) Analysed by Ardfwedson. 



§ The Soda in this kind contains a litttle Potash. 



% Afhand. i. Fysoch. Kemi, &c. iv. 193. 



•• £din. Jour, of Science, vol. iv. 316. 



