2n 



dation, by means of rains and floods, the earthy parts have 

 been carried ofF, and the heavier metallic fragments col- 

 lected in the valley. 



FIFTH SPECIES. 

 ISERINE. 



Iserin of Werner. 



4 



EXTERNAL CHARACTERS. 



The colour is iron black, inclimng a little to brownish 



Is found in small, obtuse, angular grams, and in pebbles, 

 with a somewhat rough, strongly glimmermg surface. 

 Internally, it is shining, with semi-metalhc lustre. 

 Fracture is more or less perfectly conchoidal. 

 Fragments are indefinitely angular, and sharp-edged. 

 Perfectly opaque. 

 Hard. 

 Brittle. 



Retains its colour in the streak. 

 Is heavy, in a moderate degree (4,500). 



r OBSERVATIONS. 



VOL. X. ^ 



