GRANITE. 233 



mineral is also either white, or brown ; and is 

 thus productive of corresponding differences in 

 the colours of the granite into which it enters. 



The felspar is subject to a greater variety of 

 hue than either of the other ingredients ; and, as 

 it is commonly the most abundant, it often regu- 

 lates the colour of the rock. Dark red, and 

 white, are the most common extremes of colour, 

 und it is also found of various intermediate tints 

 of red. Occasionally it is ochre yellow, pale 

 grey, blackish grey, or nearly black, and, in one 

 rare instance, green. It does not seem well as- 

 certained, whether those varieties which, like 

 that of Labrador, disperse coloured light, belong 

 to granite : in some instances, at least, it appears 

 certain that the compounds which contain them, 

 appertain to the overlying or trap family. 



The quartz of granite is most commonly 

 white, or watery ; and, being generally the next 

 ingredient in proportion to the felspar, it also 

 assists in many cases to determine the colours of 

 the compound. Occasionally, it is also grey, and 

 smoke coloured: sometimes nearly black. It 

 may be remarked, in concluding this part of the 



