504 



MEASUREMENTS OF CRYSTALS. 



TOURMALINE. Figs. 356 to 373 incltisive. Page 

 356. 



Fig. 356. The primary, an obtuse rhom- 

 bohedron. 



PonP 133°26' 



Fig. 357, et seq. 



Ponft 152°51' 



Tonl 117 9 



Ponn 156 43 



Pono 141 40 



Pons 113 13 



TOURMALINE. 



konl 90° C 



kons 90 



lonl 120 



Zono 135 44 



Ions 150 



n on ra . • 155 9 



nons 102 26 



oono 103 20 



5 ens 120 



