80 



PROCEEDINGS OF THE NA TIONAL MUSEUM. 



vol.. XXXII. 



enstatite and olivine type are common, also of the grate and barred 

 type of the latter mineral (tig. 2, Plate IX). The groundmass consists 

 of an aggregate of olivines, enstatites, and augites, with the custom- 

 ary sprinkling of metallic iron. No true glass was observed. As 

 usual, the monoclinic pyroxene is of much the same general appear- 

 ance as the enstatite, but readil}^ distinguished therefrom by its 

 inclined though low angle (18°-25°) of extinction. The structure as a 

 whole is much confused, a feature common to stones of this class. 



The most interesting feature is the presence of occasional small 

 areas like that shown near the center in tig. 1, Plate IX. This, under 

 a low power, has all the appearance of a fragment of clastic rock com- 

 posed of rounded and irregular particles, all of the same mineralogical 

 nature (in this case olivine), embedded in a cement seemingly irresolv- 

 able but showing polarizing points. Under as high a power as the 

 thickness of the section warrants using, this interstitial material is 



seen to polarize faintly and to 

 have a granular to fibrous struc- 

 ture. In some instances indis- 

 tinct tinger-like prolongations 

 extend out from the borders of 

 the granides into the interstices. 

 The structure is not at all that 

 of minerals crystallizing freely 

 from a molten magma, but is 

 suggestive of a partial recr3\stal- 

 lizationof tinedetrital material, 

 as seen in sundry metamorphic 

 schists. The same feature is 

 shown in the tine interstitial 

 portions of tig. 2 of the same 

 plate. It is practically impossible to cut sections thin enough to 

 enable one to write as detinitely as desirable, but the structure in both 

 these cases is strongly suggestive of that seen in the meteorite of 

 Kernouve, France, and which F. Rinne," following Tschermak, regards 

 as due to a mechanical trituration and resintering from a subsequent 

 elevation of temperature. 



The chemical composition of the stone, as worked out by Mr. Tassin, 

 is as follows: 



The portion taken for analysis was badlv oxidized. It was there- 

 fore kept for some time at a temperature below red heat in an atmos- 

 phere of hydrogen. 



The nickel iron was determined in a portion of the mass weighing 2.100 

 grams. This was pulverized and treated with a solution of mercuric 



-Enstatite chondrule out of henuersox- 

 ville meteorite. 



«Neue8 .lahrl). fur Miii., eti-., II, 1895, p. 229. 



