138 



Mr HAIDINGEH on the Natural-Historical 



Smaragdite, of its geognostic position, and concomitant mine- 

 rals. Fortunately the labours of some of the most celebrated 

 chemists and geologists afford the means of doing so. 



The following analyses of the Smaragdite have been published 

 for some years. 



The agreement between the three first of these analyses, and the 

 results obtained by analyzing the several varieties of Hornblende, 

 is as obvious as the coincidence of that by KLAPROTH with the 

 components of certain varieties of Augite, although, in general, 

 these two species themselves do not present any striking diffe- 

 rence in the proportions of their constituent parts. 



The geognostic relations of what has been called Smaragdite 

 and Diallage, seem to present more peculiarity. It is principal- 

 ly to VON BUCK that we are indebted for having ascertain- 

 ed its geognostic position, and a great number of its locali- 

 ties, of which he has published the accounts in several of his 

 works, and especially in two papers on Gabbro, inserted in the 

 Memoirs of the Berlin Society. Throughout these papers he 



