436 T. T. QUIRKE 



air. Second, there are rough surfaces, not smoothed by fusion 

 and still bearing the roughness of original fracture, burned to a 

 dark-brown color, the points being rounded off and black, but the 

 depressions being unfused in places. These areas cut sharply 

 across the black, well-fused faces, and are clearly of later origin. 

 Third, a few small fragments have some surfaces only slightly 

 fused; perhaps the words "scorched" or "singed" well describe 

 the degree of fusion. Only the points of rough, broken surfaces 

 are blackened by fusion, most of the area is light gray and unfused, 

 but here and there outstanding pyroxene chondrules and troilite 

 grains have melted and run a few millimeters over the unfused 

 material. These faces, in some cases, are in the form of spalls 

 out of the other types of fusion crust. It is clear that they are 

 the youngest of the fused surfaces (Fig. 2, B and C). 



Under the microscope it can be seen that these stones are com- 

 posed chiefly of ohvine, monoclinic pyroxene, glass, metallic iron, 

 and troilite. The texture is markedly chondritic. The matrix 

 consists chiefly of small crystals and fragments of olivine and 

 pyroxene scattered throughout a scanty, glassy matrix. The 

 chondrules are of the following types : (a) Spheroids, each composed 

 of part of an olivine crystal, (b) Spheroids, each composed of 

 part of a pyroxene crystal, (c) Little spheroids of colorless glass. 

 (d) Larger spheroids containing well-defined olivine crystals. In 

 some examples the crystals are crowded together, in others they 

 are scattered in the glassy ground-mass of the chondrule. In a 

 variety of this type the crystals appear to be arranged with their 

 crystal axes parallel, (e) Glassy chondrules with radiating and 

 fibrous cryptocrystalline texture. Some of the large pieces of 

 olivine show many minute inclusions in irregular linear distri- 

 bution. 



A notable characteristic of this meteorite is the veining (Fig. 2, 

 A). The veins are composed chiefly of troilite, and metallic 

 iron and nickel. They are not continuous, for they contain areas 

 in which there is no metallic material. The veins seem to vary in 

 different cases from containing almost nothing but metal to carry- 

 ing only troilite. In most cases metal and sulphide are mingled 

 in a manner which suggests contemporaneous deposition or con- 



