1S« 



132 



Outlines of the Mineralogy and Geology 



Species I. — Hydrogen gas. 





Siihspedes h Carburetted Hydrogen 



IL 



Peat 



Variety !• Fibrous Peat 



2. Compact Peat 



CLASS IV,-^METALLWIC FOSSILS. 



These possess great specifick gravity, being usually five or six 

 times heavier than water. The genera are founded on the pre- 

 dominant metal. 





GENUS l.^COPPER 



Species I. — Pyritous Copper. 



Muriate of Copper 



II. 



GENUS U.—1R0^Z 



Species I, — Sulphuret of Iron. 



II. — ^iVIagnetick oxide of Iron 



XT 



III. — Micaceous oxide of Iron 



IV. 



Ocbrey brown oxide of Iron 



V. — Nodular Ironstone. 



VI. 



Carbonate of Iron. 



GENUS Ill.-^LEAD. 



Species I — Common Sulphuret of Lead. 



GENUS lY .-^MAJ^GAJ^ESE 



Species T. — Earthy oxide of Manganese. 



T' 



