100 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 57. 



County, Texas, stones and others of Meunier's tadjerite group as to 

 suggest a similar origin; that is, as developed from a normal chon- 

 drite (aumalite) through a process of heating. It is further tobe noted 

 that the dark portions are much richer in metal and, judgmg from the 

 formation of abundant hydroxide of iron on a freshly cut or broken 

 surface, richer also in ferrous chloride. These facts are borne out 

 by the analyses noted later. The manner in which the metal occurs 

 is mteresting and peculiar, leaving no question as to its secondary 

 origin and the foreign nature of the inclusion as well. One of these 

 occurrences is shown enlarged some three diameters in plate 18, the 

 metal in fine threads cutting across the surface in a manner strongly 

 suggestmg the figures sometimes given to show the play of lightning dur- 

 ing a heavy electrical storm. Aside from these forms the metal at times 

 completely surrounds a chondrule and even penetrates into it in the 

 form of fine threads. The appearance is in entire accord with the 

 idea of its late introduction after the crystallization. 



It is evident at once that we have here a meteoric breccia composed 

 of fragments of tv^'0 quite dissimilar stones. This is sufficiently 

 apparent from both megascopic and microscopic examination. The 

 careful work of Mr. Shannon, the analyses quoted below, is fully 

 confirmatory. 



CHEMICAL ANALYSES BY E. V. SHANNON. 



Before the intergrown nature of the pyroxenic constituents was 

 suspected the clean, chalky-white portion was carefully sampled, 

 crushed, and separated from possible impurities by the mercuric- 

 iodide gravity solution. The results of an analysis of the powder 

 thus obtained are given in column I below. In columns II and III 

 are given for purpose of comparison previously reported analyses of 

 enstatite from the meteorites of Bishopville, South Carolina, and 

 Hvittis, Finland. The comparison with the enstatite of Hvittis, 

 it will be noted, is particularly close. 



