216 Rev. S. Haughton on the Chemical and Mineralogical [June 21, 



meteorite is chrysolith, or the silicate of magnesia and iron represented by 

 the formula 



3R0, SiOg; 

 in which magnesia preponderates greatly over the iron. 



The 38"3 grs. of mineral, insoluble in muriatic acid and in carbonate of 

 soda, were now divided into two equal portions, of which one was fluxed 

 with carbonates of soda and potash, and the other with lime and chloride 

 of ammonium — with the following results : — 



grs. 



Silica 10-85 



Alumina 0*23 



Peroxide of iron 2*51 



Oxide of manganese (MUg O ) 0*30 



Oxide of chrome (Cr^ O3) 1*42 



Carbonate of lime none 



Pyrophosphate of magnesia 11 '50 



Potash and soda chlorides 0'30 



Platino-chloride of potassium 0*50 



Assuming the chrome to be present as chrome-iron, 

 FeO,Cr,03, 



we find grs. 



Original weight 19*15 



Chrome-iron 2*08 



Earthy insoluble 17 07 



If we now omit the chrome-iron and make the necessary reductions in 

 the foregoing results, we obtain — 



III. Earthy Mineral (insoluble.) 



grs. per cent. Oxygen. 



Silica 10-85 .... 63-56 



Alumina 0-23 1-34 



Protoxide of iron 1-60 9*37 



Protoxide of manganese 0-30 .... 1*75 



Lime none .... 



Magnesia 4*13 24-19 



Soda 0-08 0-47 



Potash 0-09 0-52 



[Gain] [0-21] .... [1-20] 



33-000 

 0-525 

 2-078 

 0-392 



9-666 

 0-119 

 0-087 



17-07 100-00 45-867 



The oxygen of the protoxides of the preceding analysis amounts to 

 12-342 per cent., but it would be fallacious to form any opinion as to the 

 composition of the whole, so long as we are not acquainted with the con- 

 stituent minerals that compose it. 



