522 OVERLYING ROCKS. 



D. Miscellaneous minerals. 



Sulphat of barytes. Green earth- if different, 



Sulphat of strontian. Steatite ; soft and indurated. 



Olivin. Lithomarge. 



. Epidote. Chlorophoeite: Macculloch 

 Mica. W. Isles. 



Chlorite: scaly, or crys- Conite: the same authority, 



tallized. Leucite : Brochant. 



E. Metallic minerals. 



Specular iron. Pyrites. Copper. Galena. 



The following mineral substances are occa- 

 sionally found in some of the rocks of the pre- 

 ceding catalogue, not occupying amygdaloidal 

 nodules; and the varieties which contain them 

 cannot therefore with propriety be ranked in 

 the preceding or Fourth Division. As in other 

 cases, they must be considered as adventitious 

 occasional minerals. 



Apatite. Asbestus. 



Tourmalin. Schiller spar. 



Garnet, Meionite. 



Opal. Sommite. 



These have been observed in the recent 

 greenstones and basalts. It is uncertain whether 

 the two last substances do not rather belong to 

 lava than to the proper traps. 

 Precious Opal. Chrysoprase. 



These occur, but rarely, in certain porphyries. 



