FOE, SOLIDS AND LIQUIDS. 



55 



2d. Double and Triple Oxides. 



Namk. 



Sodium uranium oxide 



Delafossite 



Spinel 



u 

 a 



ti 



it 

 tt 



Gahnite 



Formula. 



Na 2 U 3 O 10 .__ 

 Ou/ 2 Fe'" 2 U 3 



Me ALO 



Zn AL(L 



Sp. Gravity. 



6.912 ___ 

 5.07, 25° 



3.452, artif.— 

 3.48, natural \ 

 3.52 " | 

 3.523 " _. 



3.631 ) 15°.5, 

 3.715 j nat. 

 3.77 



4.580, artif. 

 4.317 

 4.589 

 4.89 .._ 

 4.91 J 



Authority. 



Drenkmann. J. 14, 



257. 

 Friedel. C. R. 77, 



211. 

 Ebelmen. J. 4, 12. 



Breithaupt. 



Haidinger. Dana's 

 .Miii.' 



Church. Geol. 



Mag. (2), 2, 320. 



Jeremejew. J. 37, 



1918. 

 Ebelmen. J. 4, 13. 



G. Rose. 



Brush. A. J. 3. (3), 

 1, 28. 



