ELISHA MITCHELL SCIENTIFIC SOCIETY. 



51 



already been detailed in Hie preceding pages, under the liead of 

 Elnierald. As early as November, 18(S0, I had shown this new 

 emerald-green variety to possess the characteristics that are con- 

 sidered necessary in a gem stone, i e., beauty, hardness, trans- 



CRYSTALS OF HIDDENITE, FIGURED BY E. S. DANA. 



parency and rarity. It did not take long, therefore, for this new 

 gem to be appreciated on its own merits and find sale as a 

 precious stone. Almost at once sales were made at the high rate 

 of $100 per carat, and within a year from its discovery it had 

 been successfully introduced, both at home and abroad, as a gem 

 of the highest rank. Hidden ite is to the species spodumene 



/f1 



t 



» 

 fe 



A'- 



4 

 4 



4 



CRYSTALS OF HIDDENITE SHOWING TWINNING, AND ROUNDED TERMINA- 

 TIONS DUE TO NATURAL ETCHING. (DRAWN FROM NATURE). 



exactly what emerald is to the species beryl, i. e., a chrome green 

 variety. Its hardness nearly equals the emerald. Its density 

 varies from 3.15 to 3.19. Its form is monoclinic, and the crys- 



