284 A. J. 21 oses — Crystallization of Luzonite. 



Mr. John Crawford, Jr., made triplicate analyses for me of 

 selected material for total iron and for FeO, the result being : 



Fe per cent. . FeO per cent. 



67-15 1-97 



67-07 • 166 



67-22 1-54 



67*15 average. 1*72 average. 



Deducting the 1'3-i Fe equivalent to 1*72 FeO leaves 65*81 Fe 

 present as Fe 2 3 or 91 - 00 per cent. 

 The total analysis becomes : 



Insoluble 1'50 



CaO calculated to CaC0 3 2-85 



Fe 2 3 94-00 



FeO 1-72 



100-07 



Or recalculating the Fe 2 3 and FeO to 100 per cent. 



Fe„0 3 _ 98-20 per cent. 



FeO 1-80 



Columbia University, June, 1905. 



