S. W. McCallie—The Pitts Meteorite. 215 



Min eral Composition . 



The composition of the meteorite, as shown by analyses 

 made by Dr. Edgar Everhart, acting chemist, of the State 

 Geological Survey is as follows : 



Analyses of Pitts Meteorite. 

 Constituents Stony Part Metallic Part 



Iron 09 91.50 



Nickel 32 6.67 



Tin 20 .0-4 



Copper 00 trace 



Silicon 00 1.40 



Sulphur 28.30 .02 



Cobalt trace .45 



Manganese 00 .05 



Manganese oxide (MnO) 27 



Soda 1.17 



Potash 32 



Magnesia 5.96 



Alumina 30 



Ferrous oxide . . 65.52 



Phosphorus pentoxide 07 



Silica 8.46 



Carbon by difference 2.32 



Reckoning the sulphur and iron as pyrrhotite (FeS) the 

 stony material contained 77.62 per cent of pyrrhotite, the 

 rest, omitting carbon, corresponding most nearly to 

 hypersthene. 



Dr. George P. Merrill of the National Museum, who 

 made an examination of the stony part of one of the 

 fragments, advised me that by optical and chemical 

 methods he was able to make out the following minerals : 

 olivine, diopside, and a plagioclase feldspar. 



Fully 90 per cent of the four fragments was metallic, 

 specific gravity 7.23. 



Atlanta, Georgia. 



