190 PHYSIOGRAPHY. 



Spathic Iron. 



to new planes g. g on g = 136 34'. Fig. 400. o on v 



Cleavage, perfect parallel with P ; rarely, traces of g. 

 Fracture imperfectly conchoidal. 



Surface, o generally rough ; P often rounded, which 

 terminates in the saddle shaped lens. Fig. 403. o streaked 

 parallel to the edges of combination with P ; u rough. The 

 common lens is produced by continued striae between g 

 and P. 



Lustre vitreous, inclining to pearly. Color various 

 shades of yellowish grey, passing into ash-grey and green- 

 ish grey ; also into several kinds of yellow, white and red. 

 Streak white. Translucent, in different degrees. 



Brittle. Hardness=3*5 . . . 4-5. Sp. gr. = 3-829. 



Compound J^arieties. Striae upon the faces of P in the 

 direction of the horizontal diagonals ; and faces of compo- 

 sition parallel to g prove the existence of a regular compo- 

 sition. Botryoidal and globular shapes : composition co- 

 lumnar, surface drusy. Massive : composition granular, 

 passing into impalpable. 



1. The massive varieties of the present species are often regularly 

 compound in the direction of the faces of g, as in the annexed figure. 

 Fig. 403. 



