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The Ohio Journal of Science [Vol. XXI, No. 8, 



The following analyses show the composition of the sand: 



Silica, SiOo 



Alumina, AI2O3 



Ferric oxide 



Calcium oxide, CaO. . . . 

 Magnesium oxide, MgO 

 Titanium oxide, Ti02. . . 

 Loss on ignition 



Microscopical examination of the steel molding sand showed 

 the following minerals which are named in the order of their 

 abundance : 



