184 Bradley — Composition of the Mineral Wanoickite. 



M <o>\ 



<x o 



M < > 



The theoretical composition corresponding to this formula 

 would be 



B,0 3 = 25-81 



Ti0 2 = 29-54 



3MgO = 44-65 



100-00 



In conclusion, the author here wishes to thank Professor 

 W. E. Ford for his kind advice and assistance. 



Mineralogical Laboratory of the 



Sheffield Scientific School of "Yale University, 



New Haven, Conn., June, 1908. 



