452 ON THE TOPAZ OF SCOTLAND. 



generally bevelled at the extremity \ in size, the 

 largest topazes being found in Siberia ; and in ac- 

 companying minerals, which are usually rock- 

 crystal and precious beryl. 



Lastly, the Siberian topaz is said to occur in 

 drusy cavities or veins in granite, and in conside- 

 rable quantity. If this account be correct, we 

 may infer that the Aberdeenshire topaz will be 

 found in drusy cavities or veins in granite, and in 

 considerablequ a ntity. 



I trust the conjecture I have now suggested, 

 will induce mineralogists to examine the tract of 

 country where this interesting mineral is found 



* Since this paper was read to the Society, I have 

 been informed by my friend Colonel Imrie, that the 

 large fragment of topaz in the possession of Mr Far- 

 emharson of Invercauld, was broken from a mass of gra- 

 nite. 



