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 139 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 3-70A 



Ditto in powder,. -. 3-818 3-729 



Constituents soluble in acids : 



Uncombined Iron, ..... 17.77 1620 



Sulphur, 1-75 1-77 



Magnesia, 13-65 13-88 



Protoxide of Iron, 667 776 



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 



