352 Mallet — Stony Meteorite from Coon JSutte, Arizona. 



include an area of above 10 ram square, it is possible that fur- 

 ther study might relegate it to the Cgb group, of which the 

 Pnltusk stone is a well known representative. 



For the photo-micrographic illustrations accompanying these 

 notes I am indebted to the U. S. Geological Survey." 



The chemical analysis was found to be somewhat trouble- 

 some, particularly in regard to the distribution of the iron pres- 

 ent in several different chemical conditions. The greater 

 part of the metallic nickel-iron, accompanied by some schrei- 



Section showing enstatite choudrule. 



bersite and pyrrhotite, was separated from a pulverized sample 

 of about fifty grams, free from crust, by means of a magnet, 

 but it was not possible to obtain complete separation in this 

 way, so that a small proportion of silicates had to be deducted 

 from the magnetically separated part, and a small proportion 

 of the constituents of the nickel-iron, schreibersite and pyrrh- 

 otite to be in like manner deducted from the siliceous part of 

 the mass dissolved by acid. The part left by the magnet was 

 digested with hydrochloric acid of 15 per cent strength for 

 three days at a moderate heat, and thus a general separation of the 

 decomposable from the undecomposable silicates was effected, 

 but several determinations of particular constituents had to be 

 made on individual portions. Hydrofluoric acid was used to 

 obtain the alkalies, and the same reagent, with exclusion of 

 air, to secure a determination of ferrous iron. 



The following statement gives the general results reached, 

 with an appended account of how they were obtained. 



