1869.] Analysis of the Khettree Meteorite. 257 



The earthy matter insoluble in acid is Augitic in character and 

 closely resembles in composition the minerals Tremolite and Actynolite, 

 except that above two-thirds of the Lime in those minerals is replaced 

 in this by Protoxide of Iron. It also contains Chrome Iron to the 

 extent of 1*89 per cent., or '59 per cent, of the entire stone. 



The earthy matter soluble in acids is somewhat similar in composi- 

 tion to Chrysolite or Peridote, but contains a larger proportion of 

 Magnesia and Iron. There is probably a much greater mixture of 

 different minerals than in the case of the insoluble portion. 



There is a little Chromium soluble in acid, and also soluble in 

 Iodine, at least partially. I have supposed it to be a constituent of 

 the Nickel Iron alloy. 



Several portions which had been treated with acids (in which con- 

 sequently uncombined Iron could not be estimated) contained in the 

 soluble portion more Silica than is given in the above analysis ; about 

 2 per cent. more. The proportion of matter insoluble in acid in 

 these cases was about 39*5 per cent, of the whole stone. 



Attention was directed, as already stated, to the differently coloured 

 portions of the stone. Analysis gave the following results- 

 Light coloured, Dark coloured, 

 chiefly. 



Specific gravity, in small pieces.......... 3*743 3*612 



Ditto ditto again wetted, .., 3*763 3*70i 



Ditto in powder, 3*818 3*729 



Constituents soluble in acids : 



Uncombined Iron, 17.77 1620 



Sulphur, 1-75 1*77 



Magnesia, 13*65 1388 



Protoxide of Iron, 6 67 7*76 



Cobalt, all, or none, or 



nearly all. nearly none. 



The portion insoluble in acids differed little in the two kinds. It 

 will be observed that the principal difference is in the relative pro- 

 portion of uncombined and oxidised Iron, the dark portion containing 

 most oxide of Iron, the light part containing most uncombined Iron, 



33 



