Mallet — Stony Meteorite from Goon Butte, Arizona. 353 



Enstatite 44-73 



Olivine 33'48 



Maskelynite (?) 6'87 



Nickel-Iron . . 8-63 



Iron rust 3-03 



Schreibersite. '76 



Pyrrhotite... .. 2-14 



Chromite -08 



99-72 



The minute amount of chromite was recovered from the 

 silica of the portion undissolved by hydrochloric acid. There 

 being but a few milligrams, no attempt was made at any 

 analysis of it beyond fully establishing the presence of chro- 

 mium. 



Pyrrhotite was calculated from the amount of sulphur found, 

 assuming the ratio S : Fe = 39 : 61. The sulphide was taken 

 as pyrrhotite, rather than troilite, as the former is believed to 

 occur more commonly in meteoric stones, the latter in meteoric 

 iron. It may of course be troilite, and it may perhaps contain 

 a little nickel. 



Schreibersite was calculated from the amount of phosphorus 

 found (partly in the magnetically separated portion, partly in 

 the residue left by the magnet) on the assumption of the ratio, 

 P : Fe : M = 15 : 56 : 29. 



Iron rust was calculated from the amount of iron found in 

 the ferric state and the amount of water driven off by heating 

 and collected, assuming the composition to be that of most 

 ordinary rust, namely, Fe 2 2 (HO) 2 . 



The nickel-iron was obtained by analysis of the magnetically 

 collected portion, deducting mechanically adhering silicates 

 and small amounts of sulphur and phosphorus found in this 

 portion, and adding a small amount of nickel found in the por- 

 tion left by the magnet (in excess of that accounted for as 

 phosphide in schreibersite) and a quantity of iron from the 

 same portion equivalent to the metallic copper thrown down 

 from a solution of cupric sulphate. 



The percentage composition of the nickel-iron, as thus 

 obtained, is 



Fe 88.81 



Ni 10-72 



Co .-.: -15 



Cu . trace 



Sn -01 



Mn trace 



C trace 



99-69 



