The Meteoric Irons from Griqualcmd East, South Africa. 17 



Weight in 

 grams of ma- 

 terial used 



Fe 



Ni 



Co 



Cu 



Cr 



C 



CI 



P 



S 



Assuming iron and chlorine to be combined as the so-called 

 lawrencite, the mineralogical composition of the piece analysed 

 would thus be : — 



Nickel-iron 98-64 



Iron-nickel-phosphide 1-23 



Troilite 0-08 



Lawrencite 0-05 



100-00 



Dr. W. Leick determined the sp. gr. of three different slices 



as 



1. 7-7852 temp. 15° C. (wt. of slice 25-300 grams). 



2. 7-8195 „ 15i°C. ( „ 38-988 „ ). 

 3.7-8206 „ 14|°C. ( „ 119-275 „ ). 



The differences may be due either to varying amounts of accessory 

 constituents or to the fact that the kamacite, taenite, and plessite are 

 not necessarily equally, but most probably generally unequally dis- 

 tributed, f especially when the comparison is between slices of small 

 dimensions. The mean of the above determinations is 7'8084:, 

 or for the nickel-iron, after deducting the accessory constituents, 

 7-8303. 



* As the carbon percentage is unusually high, a second control determination 

 was made from a piece weighing 8-8560 grams, and yielded exactly the same 

 result. 



t Already directly proven by the author in the case of the iron from Glorieta 

 Mountain. Meteoreisen-Studien II. Ann. des. k.k. naturhist. Hofmuseums, 

 1892 vii. 145. 



