314 



ACTINOLITE SCHIST. 



IT may perhaps appear superfluous to distin- 

 guish this rock from hornblende schist ; but as 

 it has been mentioned by Saussure, as it occurs 

 in gneiss under a distinct character, and also very 

 conspicuously in the chlorite series elsewhere 

 described, it will facilitate the student's pursuits 

 to find it in a separate place. Its analogy in po- 

 sition, and in other characters, to hornblende 

 schist is in every particular so perfect, that these 

 will require no additional notice. Its most strik- 

 ing difference will be found to consist in its fre- 

 quent and intimate association with chlorite 

 schist ; the mineral, which is characteristic of the 

 latter substance, being frequently intermixed 

 with that which characterizes the former, in such 

 a manner that the two rocks pass into each other 

 by an insensible gradation. 



Substituting actinolite for hornblende, the de- 



