I 



138 



Outlines of the Mineralogy and Geology 







CLASS IV.-^METALLICK FOSSILS. 



Fixed, not volatilizable except at a white heat. 



§ Assume a vietallick form after roasting on charcoal^ while mi 



dissapated^ ajid subsequent fusion ivith borax. 



t Lustre metallick. 



GENUS I. 



SPECIES 



I. 



I 



■Pyritoiis Copper, Brass yellow ; semihard ; decrepi- 

 tates ; yields a reddish brown slag. 



GENUS III. 

 Common Sulphuret of Lead, Lead grey, shining ; soft j 

 foliated, fragments cubical. 



r 



t| Lustre non metallick. 



GENUS I. 



IL — Muriate of Copper. Green ; tinges flame bright blue and 



green. 



I 



§ JVof reducible to the metallick state*before the hloivpipe^ on charcoal either 

 with or without borax* 



tl Magnetick after roasting 



I 



Sulphuret ofli 



cubes, or an 



GENUS II. 



I. Brass yellow, metallick lustre 

 phous ; hard ; vapour sulphureous, 



II 



in 



MagneticJc oxide of Iron. Faintly glimmering ; streak 

 greyish black ; magnctick with polarity. 



Micaceous oxide of Iron, Splendent ; sliining 5 streak 

 brownish purple red ; foliated. 



-> 



