140 



Silica, 

 Lime, 

 Soda, 

 Potash, 

 Alumina, - 

 Water, - 



Isle 



Royal e. 



I. 



II. 



53-45 



55-66 



31-21 



3286 



7-37 



7-31 



trace. 





4-94 



1-45 



2-72 



2-72 



Stellite from Bergen Hill. 



III. 



IV. 



54-00 



5500 



32-10 



32-53 



8-89 



9-72 



trace. 





1-90 



1-10 



2-96 



2-75 



99-69 



100-00 



99-85 



101-10 



The stellite of Thomson, Mr. Whitney observes, was probably im- 

 pure pectolite, and he refers Thomson's wollastonite to the same species. 



The above analyses do not differ much from mine, of the Bergen 

 Hill mineral, except in the presence of soda, which I still think may, in 

 some specimens, be replaced by magnesia. They confirm the results 

 of Von Kobell, and of my own analysis, in regard to the presence of 

 water. 



PHAKOLITE. 



This mineral, which has been usually considered as a variety of cha- 

 bazite, has been found by Mr. Alger, among specimens of minerals from 

 New-York Island. The crystals are very perfect double six-sided 

 pyramids, implanted on carbonate of lime. They have a wax yellow 

 color, a waxy lustre, and are transparent. They show the incipient 

 modifications, from the primary rhombohedron, to the six-sided pyramid. 

 Memoirs of the Boston Nat. Hist. Soc, ii., p. 86. 



It may be remarked that phakolite, although it has a primary form 

 differing only a few minutes in its angles, compared with that of chaba- 

 zite, is somewhat unlike in its chemical composition. Breithaupt sup- 

 poses it to be a distinct species ; while Rammelsberg, from his own 

 analysis, is disposed to regard it as a mixture of acadiolite and scolesite, 

 with an additional atom of water. 



HEULANDITE. 



(Mineralogy of New-York, page 346.) 



Well defined crystals of heulandite, with a form similar to fig. 335, 

 of the Mineralogy of New- York, have been found with stilbite, in the 

 fissures of gneiss, in 23d street, New- York. 



