PHYSIOGRAPHY. 



Quartz. 



139 



QUARTZ. Rhombohedral Quartz. MOHS. 

 Primary form. . Rhomboid. P on P =94 15'. 

 Secondary forms. 



Fig. 359. 



Fig. 360. 



Compostella, (Spain.) 

 Fig. 361. 



Chesterfield, (Mass.) 



Fig. 362. 



