DIALLAGE ROCK. 651 



THIRD DIVISION. 



Compound : of three ingredients. 



A. Diallage, felspar, and mica. 



B. Diallage, felspar, and quartz. 



These are rare. It is not unlikely that there 

 is a quaternary compound of these ingredients, 

 but it has not fallen under my notice. 



Diallage rock contains imbedded portions, or 

 rather laminar veins, some of which were already 

 mentioned, of talc, chlorite, actinolite, asbestos, 

 and steatite ; but I am not aware that it is ever 

 so minutely intermixed with any independent 

 minerals as to suffer any changes of its character. 



