')S Chemical Examination of Ekeberii-ite. 



23. EKEBERG[TE. 



Tliis name has been given to a mineral first described and 

 anal^-zed by Ekeberg in 1807.* It has been usually considered 

 as a variety of scapolile ; and its mineralogical character, 

 seems to leave no doubt that this is its true mineralogical 

 place ; though its constituents difler a little from those of 

 pure scapolite. The specimen which I subjected to analysis, 

 was sent me about fourteen years ago, hy Mr. Swedenstjerna. 



Its color is light greenish-gray. 



Lustre glistening and waxy. 



Structure imperfectly foliated. Translucent. 



Easily scratched by quartz, and sensibly by the knife. 

 Yet it strikes fire with steel. 



Fragments sharp-edged. 



Tough. 



Specific gravity 2*723. 



Before the blow-pipe it melts per se into a transparent 

 olive-green glass. 



An analysis of this mineral gave the following constituents, 



Silica, - - - _ _ 43-572 



Alumina, - - - - _ 24*480 



Lime, - - . _ _ 15-460 



Peroxide of iron, - - . _ 5'640 



Soda, - - - _ _ 9'148 



Water, - - - - . 1-800 



100 000 



These constituents indicate. 



* Afhandlingar, ii. 144. 



