PHYSIOGRAPHY. 



Yenite. 



287 



Secondary form. 





M 



M 



Elba. 



oon o - 



o on o over M - 



139 37' 

 77 16 



2. The same with edges bevelled, together with planes 

 between the bevelling planes and the summits. 



Cleavage, parallel with the longer diagonal of the prism 

 distinct; less so, parallel with M. Fracture imperfectly 

 conchoidal, uneven. Surface, lateral planes streaked ver- 

 tically, o parallel to its edges of combination between M 

 and a. 



Lustre imperfectly metallic. Color intermediate be- 

 tween iron-black and dark greyish black, passing into green- 

 ish black. Streak black, sometimes inclining to green or 

 brown. Opake. 



Brittle. Hardness =5-5 ... 6-0. Sp. gr. = 3-994, a 

 crystalline variety from Elba. 



Compound Varieties. Massive : composition columnar, 

 thin and straight, sometimes granular, the individuals being 

 scarcely distinguishable. 



1. After having been exposed to heat, it acts on the magnetic nee- 

 dle. Before the blow-pipe, it melts easily and without effervescence 



