5S Howard and Davison — Estacado Aerolite. 



The slice also shows some other interesting markings. Some 

 live centimeters from the center toward the smaller end a 

 straight dark line (ab) rims across the meteorite at an inclina- 

 tion of about 15° from the vertical. It passes just to one side 

 of one of the olivine chondrules shown in the photograph. 

 Parallel to, and 15 cm from, side A is an irregular and some- 

 what broken line composed of the metallic particles. This 

 line runs from the edge of side F nearly to the edge of 

 side B. 



The line also shows on some of the other slabs, and on one 

 of them, just before it reaches the edge of side B, it turns and 

 runs parallel with the edge for a couple of centimeters. On 

 the various slabs the metallic lines are at different distances 



Figure 4. Micro-section, x 40. 



from side A, indicating that a seam of this material passes 

 through the meteorite obliquely to the cut surface. From the 

 edge of side F, which shows comparatively slight oxidation, 

 three indistinct veins run into the meteorite. They are black, 

 indefinite in outline, and somewhat branching. 



A penological analysis by W. Harold Tomlinson of Ger- 

 mantown, Pa. shows that the mineral constituents are olivine 

 and enstatite. Some pyrrhotite was also found. Mr. Tomlin- 

 son remarks : " The olivine and enstatite occur both as grains 

 and as chondri. The grains of olivine contain frequent inclu- 

 sions of smaller grains and of iron, and occasionally have gase- 



