558 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 54. 



Concerning the stone of 1878, little more need be added to what 

 is given in the paper referred to above. A broken surface shows 

 a dense, dark-brown stone, very indistinctly chondritic and with 

 none of the mineral constituents determinable by the unaided eye. 

 A freshly polished surface is of a greenish-gray cast and shows 

 abundant flecks of metal, but the chondritic structure still remains 

 obscure (see fig. 1, pi. 86). On going over the sections a second 

 lime I find the colorless interstitial mineral full of gas cavities, 

 referred to in my paper of 1888, and concerning the nature of which 

 I was then in doubt, to be a calcium phos- 

 phate occurring in the characteristic, irregu- 

 lar fornis (see text-fig. 1). It differs some- 

 what from other occurrences which I have 

 described in that it shows a somewhat higher 

 relief in the section and is rendered actually 

 clouded by the abundance of empty, irregular 

 cavities. Its phosphatic nature has been de- 

 ^S '^sTnJ.TZ:^Z^ termined beyond doubt by microchemical tests. 

 Bluff, Fayette County, The first chips forwarded of the stone found 



METEORITE. ACTUAL SIZE . ^ r\r\r\ T IS> 1 1 j. Tj.j.1 • 



about 1.5 MM. IN GREATEST m 1900 diiiered but little m macroscopic ap- 

 DiAMETER. pcaraucc from the above, being dark brown- 



ish in color with no distinctive structural features, though in thin 

 section the chondritic structure is much more pronounced (see fig. 

 2, pi. 86). The most striking difference lies in the physical condi- 

 tion of the two prevailing silicates, the olivine and enstatite. In 

 the stone of 1878 they are so filled with dust-like particles as to be 

 dull and cloudy, while in that of 1900 they are clear and pellucid. 

 The difference may be compared with that so frequently found 

 between the feldspars of some of our older granites and those of the 

 more recent effusive rocks. Further, the ground of the stone of 

 1900 is doubtfully crystalline. Indeed, I am disposed to consider 

 it fragmental, and to class the stone, following Brezina, as a veined 

 spherulitic chondrite (Cca). An equally distinctive feature, how- 

 ever, lies in the fact that in the slides of the 1900 stone I find numer- 

 ous chondrules composed wholly of the polysynthetically twinned 

 pyroxene, none of which appear in any of the slides examined of 

 the 1878 find. The calcium phosphate occurs here also, but in clear, 

 limpid forms lacking the cavities so conspicuous in the .other. Both 

 stones are veined, though in the find of 1900 the vein filling seems 

 less dense and the included silicate fragments more angular and 

 otherwise less altered. 



An interesting feature brought out by a cross section and shown 

 in plate 87 is the peculiarly pitted character of the interior of the 



