352 0. C. Farrington — New Pennsylvania Meteorite. 



one millimeter in width, thus placing the meteorite in the 

 group of medium octahedrites. For the most part the lamellae 

 show simple, broad bands of kamacite, but some of these are 

 seen on closer examination to be made up of smaller lamellae 

 grouped together. The kamacite shows considerable hatching, 

 generally in a single direction. Where fields occur they 

 appear to be mainly of two kinds : 1, those made up of 

 numbers of minute taenite foliae with parallel arrangement and 

 parallel to the adjoining bands, and 2, those made up of 



Fig. 2. 



Fig. 2. Etched section of Shrewsbury meteorite — 1/2 nat. size. 



kamacite grains bordered by taenite and showing a more or 

 less divergent arrangement. Accessory constituents are com- 

 paratively abundant and scattered irregularly over the section 

 though somewhat more numerous toward the periphery. They 

 include troilite and schreibersite, the troilite occurring in sphe- 

 roidal and the schreibersite in hieroglyphic forms. The troilite 

 is characterized by a bronze-yellow color and dull luster, the 

 schreibersite by a tin-white color and shining luster. One 

 troilite nodule in the section especially studied by the writer is 

 nearly circular in form, 2 cm in diameter and has an irregular 

 border of schreibersite. In other places the troilite has a 

 more nearly vein-like distribution and is more or less mixed 

 with schreibersite. Hieroglyphic schreibersite occurs at 

 several points, usually in groups of three. The grains are 

 from 4 to 8 millimeters in length. Swathing kamacite from 

 2 to 4 millimeters in width surrounds the scheibersite 

 inclusions, but there is none about the troilite. 



