172 



Catalogue of the minerals which are occasionally 

 imbedded in rocks^ so as sometimes to modify 

 the characters of the mixtures in which they 

 are found. 



Garnet. Chrysoberyl. 



Olivin. Fluor spar. 



Cyanite. Corundum. 



Finite. Oxydulous iron. 



Spodumene. Pyrites. 



Chiastolite. Chromat of Iron. 



Staurotide. Prehnite. 



Epidote. Andalusite. 



Mesotype. Apatite. 



Zircon. Sphene. 



Topaz. Oxyde of Tin. 



Beryl. Molybdena. 



In this list, and in each division, the minerals 

 placed towards the end, become gradually so rare, 

 that they can scarcely be said to modify the aspect 

 of the rocks, as those do which are found at the 

 beginning. Besides these, many other minerals 

 also, are found in rocks ; generally very sparingly 

 dispersed, and sometimes occupying short veins 

 rather than imbedded in the general composition. 

 It appeared preferable to enumerate these under 



