290 MEMOIRS NATIONAL ACADEMY OF SCIENCES, VOL. XIII. 



is of an irregular conical shape, having a flattened base, and is covered with a dull heavy hlack coating. The specific 

 gravity is 3.65. The fractured surface has a grayish aspect, and when examined closely, especially by the aid of a 

 glass, exhibits numerous greenish globules with a whitish granular material between; through the mass are dark par- 

 ticles consisting principally of nickeliferous iron, with some pyrites and a few specks of chrome iron. The nodules 

 are sometimes 3 or more millimeters in diameter, and of an obscure fibrous crystalline structure, the crystals radi- 

 ating usually from one side of the nodule; they have a dirty bottle-green color, a greasy aspect when broken, and more 

 or less opaque. 



Some of these little nodules were separated in a tolerable state of purity, amounting to 121 milligrams; on analysis 



they afforded: 



Oxygen ratio. 



Silica .' 48. 62 29. 90) 



Alumina 8. 05 3. 79) 



Iron protoxide 11. 21 2. 5li 1 



Magnesia 30. 18 11. 80) 



98.06 



The hardness of the mineral is about 6, and it is quite tough. The formula would be RO, SiO 2 , with a part of the 

 silica replaced by alumina, a not infrequent 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 bron- 

 zite or hornblende, but I am more inclined to the former supposition, as it appears to take the place of enstatite in 

 many meteorites. Nickeliferous iron constitutes about 7 per cent of the mass, and a portion separated in as pure state 

 as possible afforded on analysis: 



Fe Ni Co 



86.92 12.01 0.75 =99.68 



These are the proportions after allowing iron for a small amount of sulphur, present in a minute quantity in the 

 nickeliferous iron, which could not be separated mechanically. I did not test for copper or phosphorus; the quantity 

 of iron separated from the stone did not warrant my making special analyses for substances, the quantity of which 

 present could only be exceedingly minute. 



The stony matter freed from the iron was treated with nitro-hydrochloric 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 hydrochlorate of baryta 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 carbonate 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. 

 The various analyses referred to above gave, omitting the nickeliferous iron: 



The part soluble in acid 58.05 



The part insoluble in acid 41. 95 



Soluble part. Insoluble part. 



Silica 41.08 56.03 



Alumina 0. 32 5. 89 



Protoxide of iron 18.45 15.21 



Magnesia 41. 06 21.00 



Lime 0. 10 



Soda, with a little K and Li 2.97 



100. 83 101. 20 



The soluble part consists principally of olivine. The insoluble is doubtless the bronzite already referred to, with 

 a little albite or oligoclase. 



Chrome iron was detected by fusing some of the stony part of the meteorite with carbonate of soda and a little nitor, 

 and separating in the usual way. The quantity was quite minute. 

 The composition of the stone as made out would be: 



Nickeliferous iron 7. 00 



Magnetic pyrites 6. 10 



Bronzite or hornblende 



Olivine 



Albite or oligoclase .- 



Chrome iron. 



100.00 



