358 STEWART COUNTY (GEORGIA) METEORITE. 



alumina, a not unfrequent case in minerals such as hornblende, 



hypersthene, etc. As it is impossible to derive any light from 



its crystalline structure, the above analysis warrants me in 



concluding that it is either bronzite or hornblende, but I am 



more inclined to the former supposition, as it appears to take 



the place of the enstatite in many meteorites. 



Nickeliferous iron constitutes about seven per cent, of the 



mass, and a portion separated in as pure a state as possible 



afforded on analysis: 



Iron .' 86.92 



Nickel 12.01 



Cobalt 75 



99.68 



These are the proportions after allowing iron for a small 

 amount of sulphur present in a minute quantity in the nickel- 

 iferous iron, which could not be separated mechanically. I did 

 not test for copper or phosphorus. The quantity of iron sepa- 

 rated from the stone did not warrant my making special analyses 

 for substances the quantity of which present could only be ex- 

 ceedingly minute. 



The stony matter freed from the iron was treated with nitro- 

 muriatic acid and water, and heated for some time over a water- 

 bath, renewing the water and acid once or twice; the solution 

 was filtered and the residue washed ; the residue was then treated 

 with a warm solution of caustic potash, filtered, and again washed. 

 The filtrate was neutralized by hydrochloric acid and added to 

 the first filtrate, and the whole evaporated ' to dryness over a 

 water-bath, warmed gently over the lamp, and treated with 

 water and a little hydrochloric acid, thrown on a filter, the 

 silica collected and estimated ; the last filtrate was treated with 

 a solution of chloride of barium to ascertain the quantity 

 of sulphuric acid present (due to the pyrites in the original 

 mass) ; it was found to indicate 6.10 per cent, of magnetic iron 

 pyrites. The solution freed from the excess of baryta was now 

 analyzed in the ordinary way. 



The insoluble portion of the meteorite was fused with car- 

 bonate of soda and a small fragment of caustic potash, and its 

 ingredients ascertained. 



A separate portion of the stony part of the meteorite was 

 examined, for alkalies. 



