PHYSIOGRAPHY. 



Cobaltine. 



137 



Differing from fig. 139 by the re- 

 duction of the irregularly six-sided 

 planes 7c, to small triangles. 





P on P' or P ' . 



a on a' or a" ... 



P or P" on a 



Ponil, P'on/.-T, orP'on&2" 



P on 2, P' on &2', or P '' on 7c2" 



a or a on &2 



a on i 



2' on /&' 



The above crystal.?, all from Tunaborg, (Sweden.) 



Cleavage parallel with faces of the cube, perfect. Frac- 

 ture imperfectly concboidal, uneven. Surface, the faces of 

 the cube streaked in three directions perpendicular to each 

 other. The remaining faces smooth. 



Lustre metallic. Color silver-white, inclining to red, 

 Streak greyish-black. 



12* 



