1922] A Magnetite-]\Iakble Ore at Lansing, N. C. 145 



CHEMICAL COMPOSITION OP MAGNETITE FROM THE LANSING 

 MINE, N. C, AND THE AHLES MINE, N. J. 



I II 



iSiOj 2.33 1U.60 



AljO^ 2.38 1.8d 



FeA 60.42 48.44 



Cr^Os .00 



FeO 24.80 29.32 



MnO 3.01 MnOj = 4.19 



MgO 3.37 .62 



CaO 1,14 .29 



Na.O 26 -^o 



K.O tr 



TiO. tr tr 



C02 1.97 



PA tr tr 



SO3 11 .06 



HoO— 04 1.36 



H,0+ 83 2.55 



S 00 



VA 00 



BaO 00 .41 



SrO 00 



F 00 



100.66 99.81 



The analysis of the Lansing ore is that of a very pure magnetic 

 ore. A calculation indicates the presence in it of the following com- 

 ponents : 



CALCULATED MINERAL COMPOSITION OF LANSING ORE 



Magnetite 81.0 



Limonite -J-O 



Pyrolusite •--'j 



Dolomite -i-J 



Pyrite I 



Silicates 6.2 



100.0 



The magnetite is remarkahly pure. It evidently contains a little 

 manganese, but is free from titanium. In these respects it closely 

 resembles the magnetites in the Franklin limestone in New Jersej'."* 



The percentage of Fe indicated by the analysis is 61.58% and of 



Bayley. W. S. Final Report Series of the State Geologist (New Jersey), 7: 111. 1910. 



