516 G. P. Merrill — Minor Constituents of Meteorites. 



The amount of the rarer elements found in different samples 

 of this iron was quite variable, but always small. From one 

 portion of 25 grams was obtained 0*004 gram of platinum and 

 from another portion of 100 grams weight but 0*0002 gram. 

 The precipitates of ammonium platinic chloride were in all 

 cases faintly orange, indicating the presence of palladium but 

 in amounts too small for determination. In a 100-gram sample 

 of the iron were found 0*014 gram of ruthenium and 0*028 

 gram of iridium, while another portion of equal weight yielded 

 but 0-0009 gram of ruthenium and 0*0011 gram of iridium. 

 So far as I am aware, this is the first recorded occurrence of 

 ruthenium in a meteoric iron. The probable presence of 

 iridium in the Toluca and Coahuila irons was recognized by 

 Davison, as already noted, but is not elsewhere recorded. 



No chromium, vanadium, molybdenum or titanium were 

 found. The mineral schreibersite, constituting 2*61 per cent 

 of the iron, was isolated and analyzed with the following 

 results : 



Phosphorus 14*00$ 



Iron 51*10 



Nickel 34*13 



Cobalt _ 0*30 



99*53 



This high percentage of nickel is comparable with that of the 

 schreibersite from the Magura iron. Even greater amounts 

 have been reported as yielded by the irons of Seelasgen, 

 Germany (36*17 per cent), and Cranbourne, Australia (38*24 

 per cent). 



(5) Stony iron (Pallasite). Mt. Vernon, Kentucky. A 

 coarse pallasite, consisting of large blebs of olivine in a mesh 

 of metal. Described by Tassin.* No complete (bulk) 

 analyses made owing to the coarse nature of the stone. The 

 nickel-iron alloy yielded Tassin as follows : 



Iron . _ 82*520$ 



Nickel 14*044 



Cobalt .._ _ 0*949 



Copper _ 0*104 



Sulphur 0*288 



Silica _ 0*808 



Aluminum 0410 



Carbon 0*465 



Phosphorus _ 0*390 



Chlorine trace 



99*978 

 He also gave analyses of the included tsenite, schreibersite, 

 troilite, chromite and olivine separately, but found no con- 

 stituents of unusual occurrence. 



*Proc. IT. S. Nat. Mus., xxviii, 213, 1905. 



