450 



WASHINGTON AND LARSEN: MAGNETITE BASALT 



Analyses of Iron Ore Igneous Rocks 



Si02. . 

 AI2O3. 

 FeoOg. 

 FeO.. 

 MgO.. 

 CaO.. 

 Na20. 

 K2O.. 

 H2O+ 

 H2O- 

 CO2... 

 Ti02.. 

 P2O5. . 

 CI.... 



s 



CrsOs. 



V2O3.. 



MnO.. 



NiO.. 



CoO.. 



BaO.. 



19.74 

 9.72 



39.70 



15.60 

 3.70 

 6.64 

 0.46 

 0.66 

 0.32 

 0.04 



none 

 0.58 

 1.67 



none 

 0.44 

 0.38 



none 



99.75 



21.42 

 7.03 

 30.34 

 22.81 

 6.92 

 3.59 

 0.53 

 0.41 



0.95 



tr. 

 5.2 

 0.14 

 0.42 

 0.04 

 none 



tr. 



17.90 

 10.23 

 15.85 

 27.95 

 6.04 

 2.86 



1.33 



0.10 



15.66 



0.04 



0.14 

 0.51 

 0.55 

 tr. 



99.81 99.1599.191 



D 



11.73 

 6.46 

 30.68 

 27.92 

 3.35 

 3.95 

 0.50 

 0.26 



0.64 



0.32 

 12.31 

 0.82 

 0.12 

 0.04 



0.04 



E 



26.62 



11.62 



19.50 



21.87 



2.57 



6.47 



1.06 



0.34 



1.30 

 9.50 



0.20 



101.05 



20.30 



7.60 



29.99 



25.65 



3.68 



3.50 



1.70 



7.80 

 0.03 



0.102 

 0.34 



G 



10.77 

 4.61 

 39.27 

 21.73 

 2.34 

 4.84 

 0.31 

 0.24 



0.44 



13.52 

 0.02 



0.11 



0.52 

 0.37 

 0.27 

 0.07 

 0.07 



100.69 99.50 



H 



7.82 

 3.20 

 29.40 

 29.78 

 5.67 

 3.42 

 0.61 

 0.17 



0.38 



17.23 

 0.14 



0.06 



0.63 

 0.22 

 0.43 

 0.10 



99.26 



4.08 

 6.40 

 33.43 

 34.58 

 3.89 

 0.65 

 0.29 

 0.15 



1.32 



14.25 

 0.02 



0.20 

 0.45 



8.04 

 0.39 

 88.41 

 2.52 

 0.06 

 0.23 

 0.05 

 0.29 



0,17 



0.39 

 tr. 



0.02 



0.02 



99.71100.59 



1 Including 0.05 C. 

 2SO3 



A. Magnetite basalt (Arapahite). Pole Mountain, North Park, Colorado. 

 H. S. Washington, analyst. 



B. Iron ore. Elizabethtown, Essex County, New York. W. F. Hillebrand 

 analyst. J. F. Kemp, 19th Ann. Rep. U. S. G. S., 3: 408. 1899. 



C. Iron ore. Westport, Essex County, New York. W. F. Hillebrand, analyst. 

 J. F. Kemp, loc. cit., p. 402. 



D. Iron ore. Lincoln Pond, Essex County, New York. W. F. Hillebrand, 

 analyst. J. F. Kemp, loc. cit., p. 407. 



E. Magnetite rock. Joubrechkine, Wichera, North Ural Mountains. Duparc 

 (?), analyst. Duparc and Pearce, Mem. Soc. Phys. Gen., 36: 187. 1909. 



F. Magnetite rock. Joubrechkine, Wichera, North Ural Mountains. Duparc 

 (?), analyst. Duparc and Pearce, loc. cit., p. 187. 



G. Iron ore. Pine Lake, Victoria County, Ontario. F. J. Pope, analyst. F. 

 J. Pope, Trans. Amer. Inst. Min. Eng., 29: 380. 1899. 



H. Iron ore. Horton, Renfrew County, Ontario. F. J. Pope, analyst. F. J. 

 Pope, loc. cit., p. 380. 



I. Magnetite spinellite. Routivaara, Sweden. W. Petersson, analyst. W. 

 Petersson, Geol. For. Forh., 15: 49. 1893. 



J. Iron ore. Kiruna, Lapland. G. Nyblom, analyst. P. Geijer, Geol. Kiruna 

 Distr., 1910, p. 177. 



