PHYSIOGRAPHY. 



Spathic Iron Specular Iron. 



193 



C 3'350 7 

 Sp. gr. = 2 Q.Qgo from Traversella, Piedmont. 



1. Before the blow-pipe it decrepitates; in muriatic acid, and in nitric 

 acid, a feeble effervescence takes place, but it is entirely soluble. It 

 probably contains magnesia, lime, protoxide of iron, and oxide of manga- 

 nese. 



2. It occurs at Freiberg, as well as in Piedmont and the island of Elba. 



SPECULAR IRON. Rhombohedral Iron-Ore. 



MOHS. 

 Primary form. Rhomboid. P on P = 85 58' . . . 86 



Secondary forms. 



i. 404. 



Fig. 405. 



Vesuvius. 



Elba. 



Fig. 406. 



Fig. 407. 



Framont. 



Elba. 



VOL. II. 



17 



