PHYSIOGRAPHY. 



53 



Beryl. 



Fig. 57. 



M 



M on n 

 n on s 

 s on t 



P on 

 P on c2 

 cl on c'l 

 Mon d 



150 00 



135 00 



156 42' 



135 14' 



159 10 



179 40 



150 00 



59" 



HAUY. 



I 



PHILLIPS. 



Cleavage, parallel to all the primary planes, but not dis- 

 tinct. 



Fracture conchoidal, uneven. 



Surface, the prisms striated parallel to the axis. 



The pyramidal faces smooth. 



* Lustre vitreous. Color green, passing into blue, yellow 

 and white : the brightest of these colors is emerald green ; 

 .the greater part of the species, however, exhibits only pale 

 colors. Streak white. Transparent. . . translucent. 



Hardness=7-5 . . . 8-0. Sp. gr. =2-732 of a perfectly 

 emerald green variety ; 2*678, of an apple-green crystal. 



