14 



Annals of the South African Museum. 



lustrous lamellae with evenly etched surface more developed, and only 

 slightly, or not at all, cross-hatched. In consequence of the markedly 

 roundish (wulstig) form of these lamellae their arrangement parallel 

 to the octahedral faces appears less distinct. 



Both slices are wonderfully poor in accessory constituents, small 

 schreibersite-like granules or scales being alone present. As there 

 is no visible troilite and the analysis gives only a trace of sulphur, 

 while Brezina accentuates " the enormous wealth of Troilite grains " 

 the distribution of this iron sulphide must, as often happens, be 

 extremely unequal. 



The analysis made by Dr. J. Fahrenhorst gave the results * shown 

 in columns I.-I.c. No residue was obtained after solution in aqua 

 regia. I.d gives the total composition. l.e shows the composition 

 after removal of the iron-nickel-phosphide (FegNiP) and the ferrous 

 chloride (PeCl,). 



Accordingly, assuming chlorine and iron to be combined as the 

 so-called lawrencite, the mineralogical composition of the piece 

 analysed is : — 



Nickel-iron 98-47 



Schreibersite 1-43 



Troilite 0-01 



Lawrencite 0-09 



100-00 



* For the methods employed in the analysis see : 0. Sjostrom, Die chemische 

 Untersuchung der Meteoreisen. Mitth. aus dem naturwiss. Verein fiir Neu- 

 Vorpommern u. Riigen, 1898, xxx. 1-29. 



