1883.] 



Examination of the A IfiiMello Meteorite. 



259 



Nickel 

 Iron . . 



71 -205 



28 795 



100 -ooo 



Here, again, as I have shown in earlier analyses, the percentage of 

 nickel present in nickel-iron increases as the percentage of nickel-iron 

 becomes less. 



By long treatment with hydrogen chloride the silicates acted upon by 

 that reagent and the silicates which resist the action were separated, 

 and the stone appeared to possess the composition — 



Troilite 6 '91 9 



Nickel-iron 2 '108 



Soluble silicate 50 '857 



Insoluble silicate 40 *116 



100 -ooo 



The soluble silicate, which amounts to 50*857 per cent., and consti- 

 tutes one-half the weight of the stone, consists of — 





35 12 . . 



. . 18 73 





51 -43 . . 



. . 11 -43 





1 -518 . . 



.. 707 





4 -644 . . 



1 -327 



Magnesia 



. 7 '269 . . 



2 -904 





99 -98 





16 -37 



This olivine,, which gives a green colour to a fragment of the rock 

 that is at once recognised, is of unusual composition, containing as it 

 does more than 50 per cent, of iron oxide. It agrees most closely 

 with that which occurs in the meteorite of Ensisheim, the first 

 recorded fall which has been preserved in any collection ; it fell 17th 

 November, 1492. The latest analysis of that stone is by Frank 

 Crook, of Baltimore, made in Gottingen in 1868, and he found in the 

 soluble portion of that stone 52*90 per cent, of iron oxide. 



The insoluble portion, which forms 40*116 per cent, of the stone, 

 has the composition — 





.. 56*121 ... 



. . 29 *93 





13 *397 . . 



2*97 



Chromium oxide . . 



8 *281 . . 







6 *712 . . 



1-917 





17*263 .. 



7 -065 





102 *174 





/ 



11 *95 



The bronzite, or rather augite, also agrees very well with that 



s 2 



