52 



PHYSIOGRAPHY. 



Beryl. 



Cleavage parallel with the sides and shorter diagonal of the 

 above prism, but mostly indistinct. Fracture small conchoidal. 

 Lustre resinous or vitreous ; more inclined to the latter. 

 Color light greenish-grey, to almost white. Streak white. 

 Hardness = 5-0. Sp. gr. = 3-038. 



1. Before the blow-pipe, it is fusible alone, without any perceptible 

 change in the color of the flame. It affords a little moisture when heat- 

 ed in the matrass. It is slowly dissolved in phosphoric salt, leaving be- 

 hind flocculi of silica. With soda, it is with difficulty dissolved into a 

 dark colored pearl. From these and other experiments, it has been in- 

 ferred by MERLET to be a silicate of magnesia. 



2. It is found at Rizoni, a mountain in southern Tyrol. 



BERGMANITE. (See Scapolite.) 

 BERYL. Rhornbohedral Emerald. MOHS. 

 Primary form. Regular hexagonal prism. 

 Secondary forms. 



Fig. 55. 

 Fig. 54. 



M 



P ous 



Mons 

 Ponzf 

 Mont 



135 00 ") 



127 45' 40" I 

 150 00 

 120 00 



