PHYSIOGRAPHY. 



Tungsten. 



249 



3. It is found at Sterling, (N. J.) associated with Franklinite. 

 crystals are sometimes above an inch in length. 



Its 



TUNGSTATE OF IRON. (See Wolfram.) 

 TUNGSTATE OF LEAD. (See Schtehtine.) 

 TUNGSTATE OF LIME. (See Tungsten.) 



TUNGSTEN. Pyramidal Tungst ic-Bary te. 



Primary form. Octahedron with a square base P on P 

 over the base =130 SO', over the pyramidal edge =100 

 '8'. 



Secondary forms. 



Fig. 453. Fig. 454, 



Trumbull and Monroe, (Conn.) 



Cleavage, parallel with P and a ; more splendent in the 

 direction of the former, though more interrupted *by 

 small conchoidal fracture. Fracture imperfectly conchoid- 

 al, uneven. Surface, a irregularly streaked, sometimes 

 concave, P and the other faces are generally smooth. 



Lustre vitreous, inclining to adamantine. Color gener- 

 ally white, often inclining and passing into yellowish-grey, 

 yellowish and reddish brown, sometimes almost orange-yel- 

 low. Streak while. Semi-transparent . . . translucent. 



