72 BULLETIN fM, UNITED STATES NATIONAL MUSEUM. 



Reference. — E. Cohen, Mitth. naturwiss. Ver. Neu-Vorpommern u. 

 Eiigen, vol. 35, 1903. 



FISHER, POLK COUNTY, MINNESOTA. No. 212, 



Stone, Cia. Nearly complete individual weighing 1.30 kilograms. 

 Fell April 9, 1894 (pi. 21, fig. 2). Four stones known to have fallen, 

 the largest being broken up and scattered. The second largest weighed 

 9| pounds and is in the museum of the University of Minnesota. A 

 compact, light gray stone, thickly spotted with metallic points and 

 light gray and white chondrules. Chemical analysis by J. E. Whit- 

 field, yielded : 



I'or cent. 



Mctfillic constituents 11. 44 



Silicate constituents 88. 56 



The silicate portion yielded: Percent 



Silica (SiOi) 43.70 



Alumina (AI2O3) 4.96 



Ferrous oxide (FeO) 18.27 



Manganous oxide (MnO) .38 



Nickel oxide (NiO) .23 



Lime (CaO) 2.19 



Magnesia (MgO) 29.38 



Chromite (FeOCrjOs) j> .80 



99.91 

 The chromium present is tabulated as chromite, as it occurs as such 



in the stone. 



The metallic portion freed Trom the last trace of siliceous matter 



contained : 



Per cent. 



Iron (Fe) 85.00 



Nickel (Ni) 14.15 



Cobalt (Co) .74 



Copper (Cu) Trace. 



99.89 

 On recalculating, these figures give the bulk or mass composition 

 of the stone as follows: 



Per cent. 



Silica (SiOj) 38. G99 



Alumina (AI.O3) 4.240 



Ferrous oxide (FeO) 30.179 



Manganous oxide (MnO) .336 



Nickel oxide (NiO) .200 



Lime (CaO) 1.939 



Magnesia (MgO) 2G. 018 



Chromite (FeOCr^O^) -708 



Iron (Fe) 0.724 



Nickel (Ni) 3.608 



Cobalt (Co) .084 



90. 735 



