212 J. L. Smith — Waconda Meteoric Stone. 



This exposure has doubtless had something to do with its 

 friability as a whole, for many parts of it are quite firm 

 where the iron is not oxidized, and, as Prof. Shepard says, it 

 has the average cohesion of this class of meteoric stones. As 

 he has already given a general description of it, I will not 

 repeat it here, but proceed at once to give my chemical and 

 mineral analyses. 



The specific gravity of pieces from the interior varied from 

 3-4: to 3 - 6. and when si illy consisted of — 



Stony matter .. 90-81 



Nickel iron - 5-34 



Troilite 3-85 



The amount of the last mineral was made out by chemical 

 analysis. The nickel iron contains : 



Iron 86-18 



Nickel 12-02 



Cobalt -91 



Copper -04 



Phosphorus not estimated. 



The stony part treated with large excess of aqua regia gave : 



Soluble part . 69-00 



Insoluble part 4 TOO 



Composed of— 



Soluble. Insoluble. 



Silica .... 34-52 54-02 



Protoxide of iron 30*01 18*10 



Magnesia 32*50 23'45 



Alumina - 43 2 - 30 



Manganese -61 * 36 



Soda with trace of potash and lithia '89 I' 58 



The analysis clearly shows that the stony part of this meteor- 

 ite consists of the usual mixture of olivine and pyroxene 

 minerals ; the hyalosiderite predominating in the former, and 

 bronzite in the latter. 



Two minerals were detached in small quantities and analyzed 

 separately. The first was a dark colored mineral, readily seen 

 m BmaD parcels and veins; this, freed as far as poss 

 the adhering minerals, was found to be soluble in strong hydro- 

 chloric acid, and the prolonged action of this acid on the min- 

 eral, heated over the water bath, decomposed it very nearly 

 completely ; it is composed as follows: 



Silica 41-10 



Protoxide of iron " 27'20 



Magnesia.. 2831 



Manganese __ -32 



