2 PROCEEDINGS OP THE XATIOXAL MUSEUM vol. 75 



In the thill section the stone shtnvs a pronounced cataclastic struc- 

 ture composed of fragmental and imperfect chondrules interspersed 

 witli fine granular ]iarticles of silicate minerals and the usual metallic 

 and sul[)hide jiarticles. The chondrules vary from the densely radiat- 

 ing enstatite type to porpliyritic irregular and fragmental forms in 

 which the phenocrvsts are mainly enstatite; olivine is abundant often 

 in the form of irregular chondrules with the common grate, or barred 

 structure. (See pi. 1.) No feldspars or other silicate constituents 

 were noted. There are, however, al)undant small, colorless, and ir- 

 regular isotropic areas that might on casual inspection be mistaken for 

 a residual glass but for the pronounced fragmental character of the 

 stone. It is to be further noted that these areas are not interstitial 

 but occur for the most part if not wholly in the body of the individual 

 enstatites and olivines. The metal, it ma}^ be stated, occurs in par- 

 ticles of unusual minuteness, few of them reaching a millimeter in 

 diameter while many are microscopic and so small that even when 

 reduced to a fine powder by rubbing in an agate mortar the silicates 

 were found to still contain minute particles. 



A pronounced finely granular structure is pr(>valent throughout, 

 suggestive of crushing and frequent and abrupt changes in tempera- 

 ture. The stone is, however, unusually hard and dense. 



Mr. Gonyer 's analysis yielded results as below : 



A total of 11.2652 grams was digested in animoniuni mercuric 

 chloride. This yielded 10.6458 grams, or 94.51 per cent of silicates, 

 and 0.615)4 gram, or 5 4 per cent, of metal. These yielded as below: 



Per cent 



SiOa 37.57 



Al203___ 7. 12 



CroOs .35 



FeO 20. SO 



CaO 2. 14 



MgO 22. 71 



K2O . 21 



NaoO .78 



NiO .55 



P2O5 .24 



FeS 2. 27 Sulphide portion. 



Fe 5.03 1 



Ni .42 Ur . 11- ^• 



Co ni -^l^'tallic portion. 



Cu l.l.l\llll[llll[ll[llllllllll '. OO2J 



100. 202 



The analysis bi-ings out no new or striking feature, tliougii a little 

 lower in metal than one would assume from an examination of a 

 polished surface, and ci)nsi(h'iably below tliat of the average (12.45 

 per cent) tliat I have elscwiiere given. On tiie other hand, it is high 

 in alumina. 44iei'e is. however, no reason to question the leliability of 

 the analysis. 



o 



Silicate portion. 



