34 



AMERICAN MUSEUM GUIDE LEAFLETS 



long. More than a thousand fragments of this meteorite have been 

 found, most of which weigh from .} it of an ounce to 20 ounces, but a few 

 weigh several pounds. Each is a perfect little meteorite. The largest 

 of the group, which is exhibited here in the Foyer collection, weighs 

 about 75 pounds. The black glassy crust over the surface of all the 

 masses shows that the meteorite exploded early enough in its atmos- 

 pheric flight for even the smallest fragments to become superficially 

 fused by friction with the air. The fragments show a "primary" and 



FOREST CITY. 

 Shows crust mi large and small pieces. 



a "secondary" crust, the former formed before and the latter after the 

 bursting of the original mass. 



Forest City consists essentially of feldspar, enstatite (a member of 

 the orthorhoinbic-pyroxene group of minerals), graphite, troilite and 

 nickel-iron. The iron is present in small particles disseminated through 

 the masses and in definite lines suggesting the Widmanstatten figures of 

 a siderite. 



