172 



doubt, now that it is observed, but that it will be found not 

 unfrequently. The specimen was sent me as gathered near 

 Aberdeen by a dealer without any particular observation, 

 but I could not let it escape unnoticed here. The specimen 

 en the whole is rather dull reddish brown. 



TAB. CCGXCV. 



Golden Mica. 



This is a group of almost hexaedral laminae, but very 

 confused, and as it were compressed with layers of Sandy 

 Quartz, &c. intervening. Its lustre is often so truly me- 

 tallic that it is like thin plates or squamae of Gold, nor could 

 we represent it without metallic aid. — It is perhaps chiefly 

 coloured by Iron Ochre. 



This specimen was brought from Aberdeen, and partakes 

 somewhat of the nature of Gneiss. 



