Determination of Diallage. 147 



these minerals is so obvious, that it will be easily found in nature, 

 even by those mineralogists, who have not been aware of it, pre- 

 vious to the publication of that paper ; and no doubt but the 

 resolution of what has been taken for only one species into several, 

 must prove of great influence upon the former, namely, the deter- 

 mination of the rocks. In this respect, besides its pure natural- 

 historical purpose, the above examination of Smaragdite will, I 

 believe, not be found entirely devoid of interest. 



T 2 



