958 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvii. 



linall}', with alcohol, this last washing being allowed to run into another 

 beaker and thrown awa}*. The filtrate contains all the nickel-iron alloy 

 and perhaps about 1 per cent of the schreibersite, while at least 98 

 per cent of the phosphide is left on the paper. A complete solution 

 of the nickel iron is effected in one to three minutes. 



SCHREIBERSITE. 



The mineral thus separated had a specific gravity of 7. IT; a tin- 

 white color; and under the glass was seen to be in pea-like nodules 

 and in needles (rhabdite). An anah'sis gave the following: 



Iron 69. 33 



Nickel-cobalt 17. 26 



Phosphorus 1 2. 50 



Total •. 99. 09 



NICKEL-IRON ALLOY. 



The solution obtained from treating the magnetic residue as above 

 stated gave, on analysis, the following results: 



Iron 85.00 



Nickel-cobalt 14. 50 



Phosphorus 1.00 



Total 100. 50 



Calculating the phosphorus present as derived from dissolved 

 schreibersite, this will approximate the formula FcgNi, as given by 

 Meunier'^ for tsenite. Other analyses give: Fe, (Ni, Co),* FejgNig,^ 

 Fcj (Ni, Co)2,'^ etc. 



From these results it is evident that the so-called t^uite is of a very 

 uncertain composition. Indeed, it is not to be expected that the results 

 should be imiform, since the alloy obtained is necessarily dependent 

 upon the nature of the solvent used in its separation. 



OLIVINE. 



This mineral occurs in small granules of a yellowish-green color, 

 and that analyzed had been slightly attacked even by the very dilute 

 acid (1 HC1:25 HjO) used in the separation. An analysis gave: 



Silica 39. 10 



Magnesia 48. 20 



Ferrous oxid 12. 30 



Total 99. 60 



Specific gravity, 3.39. 



« Meunier, Meteorites, p. 49, 1884. 



^'Tassin, Proc. U. S. Nat. Mus., XXV, p. 73. 



(^Nichols, Field Columbian Publication 64, Geol. Series, I, p. 315. 



(f Weinschenk, Ann. Mus. Wien. 



