GRANITE. 237 



d. The quartz, or the felspar, or the mica, or all 

 of them crystallized. 



This variety is never perfect, as it contains 

 the same minerals also without form. It often 

 contains minute cavities, and it is in these that 

 the crystals are most distinct. Bennachie in 

 Aberdeenshire produces very perfect examples of 

 this variety. The varieties of aspect in A are in- 

 numerable ; depending on the relative propor- 

 tions of the different ingredients, on their vary- 

 ing magnitude, or their colours, and on the dif- 

 ferent modes of intermixture. 



. 







B. Quartz, felspar, and hornblende. 



a. Large grained. 



The syenite of some mineralogists ; a term 

 here limited to similar rocks in the overlying 

 family. In Scotland, at least, this variety appears 

 as common in many situations, as var. A. 



b. Small grained, and, like F.b. Div. 1st. often 

 resembling the greenstones of the trap family, by which 

 name some mineralogists have also distinguished it. 



C. Quartz, felspar, and actinolite. 



D. Quartz, felspar, and chlorite. 

 . Quartz, felspar, and talc. 



