2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 60 



nature of the stone. The total weight of all the known material, 

 accepting the figures given above and adding thereto the weight of that 

 received here, would be approximately 270 pounds, or 122, 580 grams. 1 



Microscopically the stone is of a light ash-gray color closely simu- 

 lating that of Allegan, Michigan, but is much more firm and com- 

 pact. Like the Allegan, the particles of native iron are so small as 

 to be scarcely distinguishable by the unaided eye. It differs, however, 

 radically in the size of sulphide particles and in their relative abund- 

 ance as compared with the iron. Chondrules are abundant but small 

 and quite inconspicuous, and of a color only a shade darker than the 

 ground. They rarely break with the matrix. The largest noted 

 are not over 2 or possibly 3 mm. in diameter. The crust is in all 

 cases lustreless black, or brown-black, sometimes smooth or again 

 roughly chagreen. 



The stone is interesting for the small proportion of visible metallic 

 iron and the abundance of iron sulphide, troilite. The latter occurs 

 in granules of all sizes up to 8 mm., and has a peculiar bronze lustre 

 like ordinary terrestrial pyrrhotite. It is, however, non-magnetic, 

 not being affected by an electro-magnet of considerable power, and 

 is unquestionably troilite, as shown by the analysis. It is very brittle. 

 On one of the samples a large nodule, some 6 to 8 mm. in diameter, 

 lying near the surface, has been burnt out to a depth of some 5 mm., 

 the residue having a glazed, somewhat porous surface and much the 

 appearance of a furnace slag. The cavity left is characteristic of the 

 deeper pits common to meteorites and leaves no doubt as to their 

 origin. 



Under the microscope the stone resolves itself into a fine but rather 

 loosely compacted aggregate of polarizing particles in which are 

 imbedded the numerous chondrules and large single and clustered 

 imperfectly outlined crystals of an orthorhombic and occasional mon- 

 oclinic pyroxenes and of olivine with small scattering areas of metallic 

 iron and iron sulphide. The fine loosely aggregated ground is com- 

 posed of siliceous particles in which only olivine and pyroxenes can be 

 satisfactorily identified. The chondritic structure is obscure and only 

 occasionally recognizable in this section. No well-defined feldspars 

 nor other minerals than those mentioned were identified, and there is 

 little if any true glass. Sections, however, show frequent colorless, 

 nearly isotropic areas, and occasionally a nearly colorless body polar- 

 izing faintly in light and dark color, not extinguishing uniformly 

 throughout, and with at times a faint suggestion of polysynthetic twin 



1 See Supplementary Note at end of this article. 



