NO. 20 HELT TOWNSHIP METEORITE PERRY 7 



similar incipient diffusion may be seen in plate 6, figure 2. Schreiber- 

 site inclusions presenting exactly the same appearance are observable 

 in hexahedrites and nickel-poor ataxites that have been altered by 

 reheating. 



Plate 7, figure 2, shows a larger schreibersite inclusion close to the 

 edge of the slice, which after fusion solidified with a eutectoid struc- 

 ture. While liquefied it dissolved some of the surrounding iron, which 

 later separated in minute droplike particles. 



At one point at the edge of the polished slice melted magnetic 

 oxide, produced superficially during flight, has invaded the mass 

 slightly. One of the larger schreibersite masses enveloped in the oxide 

 is scarcely altered, but one or two rhabdite crystals were observed to 

 have become rounded into droplike form. 



Because of the small size of this iron, no analysis was made. Its 

 structure would indicate approximately the usual nickel content of 

 coarsest octahedrites, a substantial amount of phosphorus, and little 

 or no sulphur. 



The name Helt Township is chosen for this meteorite, the main 

 part of which has lately been given by the writer to the United States 

 National Museum. It is the ninth meteorite, and the fourth siderite 

 reported from Indiana. 



