508 



MEASUREMENTS OF CRYSTALS. 



MICA. Figs. 385 to 39G inclusive. Page 369. 



Fig. 385. Regular six-sided prism. 



MonM 120^-0' 



MonP 90 



Fig. 386. An oblique rhombic prism, with 

 transverse sections of about 120° 

 and 60°. 

 Figs. 387, 390, 391, 392, 393, 394 and 

 396, various crystalline forms, the 

 cleavages being represented by the 

 dotted Imes. 

 Fig. 388. A six-sided table from St. Law- 

 rence county. 



Mor M'onA: 120° O' 



Fig. 389. An oblique rhombic prism from 

 Greenwood furnace. Orange county. 



Pona 114° to 115° 



a ona about 120° O' 



MICA. 



Fig. 395. 

 M on I 



150° 



EMERALD. Fig. 397. Page 374. 



Fig. 397. The primary, a regular six- 

 sided prism. 



CHRYSOBERYL. Figs. 398 to 413 inclusive. Pago 

 375. 



Fig. 398. The primary, a right rectan- 

 gular prism. 



Figs. 399 and 400. 



Mons 125°16' 



T ons 144 44 



i oni 120 



