Hoivard and Davison — Estacado Aerolite. 



57 



eight well-marked sides, one of which (F in photograph 3) looks 

 like an old fracture surface. The oxidation on this side is less 

 than elsewhere and there is no apparent variation in structure as 

 the edge is approached, such as there is on the other sides. 

 The sides are quite flat, some of them even slightly concave, 

 the edges between adjoining sides being, for an aerolite, fairly 

 angular. 



Side A has a smoothed appearance and may have been the 

 " nose " of the mass in flight. The surface markings on this 



Figure 



b E 



Longitudinal slice of Aerolite. 



side are not deep, while on sides D and E, which are opposite 

 A, there are well defined pittings. 



The stone is a crystalline chondrite, its structure being very 

 similar to the Pipe Creek aerolite, which is also from Texas. 

 In Brezina's classification Pipe Creek is placed in group Cka. 



The slab shown in the photograph is 53'4 cm in length and 

 40'6 cm in height. The polished surface shows a dull black 

 ground mass thickly permeated with irregular particles of 

 nickel iron. Roundish enstatite chondrules of a more shiny 

 black are scattered through the stone. Here and there are 

 green olivine chondrules, some of which are larger than any of 

 the black chondrules. The largest of the green ones, which is 

 in the center of the slice shown in the photograph (fig. 3), 

 measures about l cm in length. 



