Meteoric Stone which fell at the Mission Station of St. Mark's. 13 



albite," or of about 2J per cent, of the jadeite molecule (Na^O . AI2O3 . 



4SiO,). 



2 and 2a. Composition of the nickel iron dissolved in ammonium 



mercuric chloride : — 



2. 2a. 



Fe = 14-86 88-45 



Ni = 1-44 8-57 



Co = 0-25 1-49 



Mn = 0-25 1-49 



16-80 100-00 



The high percentage of manganese is the more remarkable as 

 meteoric irons are mostly free from this element. 



3. Composition of the part soluble in hydrochloric acid after 

 removal of iron pyrites, nickel iron, schreibersite, oldhamite, and 

 calcium chloride. To this is added the sulphur determined in a 

 separate portion. The quantity of metallic iron was calculated from 

 the latter, and from the proportion of Ni + Co to Fe, ascertained 

 from analysis 2. That a higher percentage of nickel iron (19-49 per 

 cent.) is here obtained than in the direct analysis (16-80 per cent.) is 

 easily explained, since a part of the nickel iron is certainly protected 

 by the enveloping silicates against the influence of the ammonium- 

 mercuric-chloride solution, f 



3. 

 SiO, 9-78 



Al,03 0-07 



FeO 5-85 



MnO 0-33 



CaO 1-33 



MgO 1-45 



Fe 26-58 



Ni 1-84 



Co 0-21 



Mn 0-29 



* The felspar, as the optical examination showed, is a basic lime-soda felspar. 

 The quantity of potash ( = 0-23) and soda (= 0-85) found by special determination 

 cannot therefore be calculated as felspar alone. If one makes a lime-soda felspar 

 containing potash, one would have to regard it as insoluble in acids. Besides, one 

 does not know whether the potash or soda belongs to the one or the other analysis, 

 since they appear in a special determination. 



The second way, indicated above by Cohen, is practicable, and after taking the 

 jadite molecule for granted, a small quartz excess would remain, the presence of 

 which is confirmed by the optical examination. — C. K. 



t Compare Fletcher, I.e. p. 293. 



