NO. 1392. THE MOUNT VERNON METEORITE—TASSIN. 215 



zigzag shapes. Bounding this outectic is seen a band of l>i-ight, white 

 iron, which varies in width from a Hno to a miiliiiieter. 



Examined under the glass the mass of the iron constituent appears 

 to be made up of minute 



octahedrons arranged in ^f^^ -> 



tine lamelhe, and consid- 

 ered as a unit may be de- 

 fined as a granuhir octahe- /i^^i^HT -:ap. 

 drite containing more or 

 less numerous troiUte and ^^^^Hv 

 schrei t xM'site areas. 



Two portions of this con- |^^^^R;^P^*-,a. IHHF^ 

 stituent, each vveighing 10 

 grams, were taken for 

 analysis, and after trt^ating 



with dihite acid for the "WS^^MB^MI^^Ml ■'^J 



separation of schreibersite, 

 ttenite, etc. , were examined 

 as follows: In one the sili- 

 con, iron, alummum, cop- section (magnified) showing structure of the 

 per, cobalt, nickel, and sul- ''^'^•^'■''^^ ^«^"""- 

 phiir were determined: in the other the carbon and phosphorus, with 

 the following results: 



Iron ,S2. 520 



Nickel 14. 044 



Cobalt 949 



Copper 104 



Sulphur 288 



Silica 808 



Aluuiiuuin 410 



Carbon 465 



Phosphorus 390 



Chlorine Trace. 



Td&nite occurs in very thin, britti(\ tin-white lamella', with a specific 

 gravity of 7 at 20.1" C, and inn ing the following composition: 



Iron 63. 99 



Nickelc 35. 98 



Cobalt 10 



Copper Trace. 



Phosphorus 04 



The material was strongly magnetic, liut did not possess polarity. 



Schreibersite occurs fairly al)undantly, approximating as it does 1.35 

 per cent of the mass by measurement and 1.95 per cent by analysis. 

 It is found bounding the olivine areas and occasionally penetrating or 

 contained in them. The more common occurrence is. however, as 

 blebs, veins, or filaments in th(^ nickel-iron constituent. The mineral 

 has a brilliant tin-white color, is strongly magnetic, possessing polarity, 



