[JOHNSTON-ELLSWORTH] ANNAHEIM METEORITE 83 



Analysis 4. — Phosphide crystals (Rhabdite?). (PI. XII, Figs. 15, 

 16; PI. XIII, Fig. 17.) 



These were obtained by sifting the residue from the solution of the 

 68 gram slice on a 200 mesh sieve, the crystals passing through. A 

 little whitish silicious matter and some carbon or graphite were 

 visible under the microscope. 



MoL. Ratios or 



Fe 40.28 0.721 \ 



Ni 41.36 0.705 lLii? = o 481 



Co 0.23 0.004 



Cu 0.77 0.012 



P 15.35 0.494 0.494 



SiOa ,.. 0.69 



C Present 



Cr, V, Mn, Ti Not detected Average. .0.487 



= 0.494 



98.68 



MoL. Ratios 

 Fe\ 



Ni I 1 442 



Co 0.487 



Cu/ 

 P 0.494 



ôii?"!"" 



Theoretical Composition for (FeNi)3P 



Fe 41.3 



Ni 43.4 



P... 15.3 



The results indicate the composition to be (FeNiCoCu)3P with 

 Fe and (NiCoCu) present in equimolecular proportions. 



That the above analysis should yield results leading to so nearly 

 an exact formula is remarkable since it appears that two different 

 types of crystals are present (page 24). It may be that the phosphide 

 can crystallize in two difïcrent systems under different conditions, as 

 does FeSo in pyrite and marcasite. 



The silica found here no doubt represents practically the total 

 amount in the 68 gram slice, occurring either as silicides or as decom- 

 posable silicates. The actual amount for the 08 g. slice is very small, 



—37 



