300 GRANITE. 



These three latter varieties are rare, but they 

 occur in different parts of Scotland. 



F, Felspar, hornblende, and mica. 



This variety occurs in the same manner as D. 

 Div. 1st. but is rare. 



THIRD DIVISION. 

 Of four ingredients. 



A. Quartz, felspar, mica, hornblende. 



This, like var. B. Div. 2d. is the syenite of 

 some writers, and is often not easily distinguished 

 from that variety, particularly when the mica is 

 black and not abundant. It is equally, or more, 

 common. Both these varieties, like all the others 

 enumerated under this head, pass into the var. A. 

 Div. 2d. or into common granite. 



B. Quartz, felspar, mica, compact felspar. 

 This might perhaps be arranged with equal 



propriety under var. A. Div. 2d. the latter sub- 

 stance being considered accidental: the compact 

 felspar is often of a bright green. Occurs in 

 Guernsey and in Scotland. 



Ci Quartz, felspar, mica, actinolite. Rare, and 

 analogous to var. A of this division. Occurs in Perth- 

 shire. 



