ART. 22 



liTEW METEORIC IRONS FROM ARIZONA — MERRILL 



rudely triangular with roughly curving sides. Weight, as received, 

 672 pounds, or 305,454 grams. The fragment first received which 

 had been " sledged " off weighed 535 grams, but whether this was 

 all of it is uncertain. Considering its oxidized condition it would 

 seem sufficient to say that its original weight was upwards of 306 

 kilograms. The weight of the smaller mass is given as 273 pounds, 

 or 124 kilograms. 



The weight of the mass under description made it somewhat diffi- 

 cult to handle, but nevertheless it was put upon the table of the 

 handsaw and three slices cut parallel with the rough broken face 

 from which the fragment had been removed by hammering. The 

 etched surface of the first of these is shown natural size in Plate 3. 

 As will be noted it is a fine octahedrite (Of) of exceptional beauty. 

 The sharply angular irregular enclosures are of schreibersite, an 

 analysis of which yielded Mr. F. A. Gonyer, student analyst in the 

 Museum laboratory, as follows: Fe, 63.62 per cent; Ni, 22.36 per 

 cent; P, 14.37 per cent. 



Of the three slices cut not one showed visible troilite or other 

 enclosures than the schreibersite noted. The iron is soft, malleable, 

 and etches very easily, with a uniformly dull surface. 



The chemical composition of the iron, as a whole, as determined 

 by Mr. Shannon in the Museum laboratory is given in column I 

 below. In columns II and III are given the analyses of two other 

 fine octahedrites made with equal care and reference to the presence 

 of rarer elements. 



REPORT BY MR. SHANNON ON THE ANALYSIS OF METEORITE FROM INDIAN 

 RESERVATION IN ARIZONA 



A piece of the iron weighing 70.2033 grams when freed as far as 

 possible from scale, was dissolved for the analysis. This solution 

 was made up to 1,500 c. c. Aliquot parts of 25 c. c, equivalent to 

 1.1701 grams, were taken for most constituents. In some cases 

 checks were run on portions equivalent to .4680 grams. The results 

 obtained are as follows (col. I) : 





I 



II » 



III' 





0.032 



90. 118 



9.118 



.147 



.002 



Trace. 



None. 



.003 



.402 



0.003 

 90.94 

 8.122 

 .462 



0.003 



Iron - -- 



89. 016 



Nickel . - 



9.660 



Cobalt - - --- 



.545 



Copper - 



.025 



Platinum— . - 



Trace. 

 None. 



Trace. 





None. 



Sulphur _ . 



.002 





.255 

 .032 



.365 



Carbon -. 



.015 









Total 



99. 825 



99. 814 



99. 630 







1 Owens Valley, Calif., Mem. Nat. Acad. Sci., vol. 19, 1922. 



2 Perryville, Mo., Proc. U. S. Nat. Museum, vol. 43, 1912. 



