169 



dient in a large class of compound rocks, chiefly 

 belonging to the primary division. 



CHLORITE, (FOLIATED). 



This is less common, and is found under 

 similar circumstances. 



TALC 



Must be considered as a rare ingredient, and 

 is limited to a very few rocks. 



HORNBLENDE. 



/ 



Hornblende, either simple, or in a state of 

 mixture with other minerals, is among the most 

 conspicuous ingredients of rocks. 



ACTINOLITE. 



This mineral, so nearly allied to the preced- 

 ing, is found in some of the same situations, but 

 must be considered as a rare ingredient. 



AUGIT. HYPERSTHENE. D1ALLAGB. 

 TOURMALIN. 



These minerals are limited to some peculiar 

 rocks, and the three latter, in particular, must be 

 considered rare. 



