116 Whitfield and Merrill — Fayette County Meteorite. 



minerals associated. 'The peculiar grate-like or barred forms 

 so characteristic of olivine chondri are here represented, as 

 are the radiating fan-shaped forms of enstatite. 



The large greenish microscopic chondri are, nnder the micro- 

 scope, seen to be made up of innumerable enstatite granules so 

 arranged as to form oval or fan-shaped areas of radiating col- 

 umns enclosing large, quite perfectly outlined crystals of the 

 same mineral. These included forms are nearly colorless or 

 merely gray through enclosures of innumerable dust-like parti- 

 cles, and show sharp and well denned cleavages parallel to 

 either prism, and a parting parallel to the orthopinacoid. Both 

 olivine and enstatite are nearly colorless or gray through enclo- 

 sures of dust-like particles, and carry but few cavities. 



In addition to the minerals above mentioned there were no- 

 ticed occasional broad, irregular plates of a monoclinic mineral, 

 light gray in color but polarizing brilliantly in red and yellow 

 colors and which gave extinction angles varying from 25° to 

 31°. Such are presumably augite or a closely allied pyroxene. 

 Nothing that can be certainly identified as a feldspar was ob- 

 served. Occasional small, nearly colorless, angular forms 

 show faint indications of twin structure, and it is possible may 

 be a plagioclase. In two sections were observed irregular 

 outlined interstitial areas, perfectly colorless and full of gas cav- 

 ities. These in some cases remained quite dark during a com- 

 plete revolution of the stage, and in others gave decided polar- 

 ization in light and dark colors, and in converging light showed 

 indistinct biaxial interference figures. The posi- 

 tion of these areas relative to the other constitu- 

 ents is that of an interstitial glass or a secondary 

 mineral, like a zeolite. As they show neither 

 cleavage nor crystallographic outlines, and more- 

 over are to be found but rarely in the sections at 

 hand, it is impossible to identify them satisfactorily. 

 The metallic iron occurs in the usual rounded 

 and irregular masses one to two millimeters in 

 diameter and is apparently in about equal propor- 

 tions with the pyrrhotite : the latter showing a 

 bright brassy luster in strong contrast with the sil- 

 very white iron. 



The black vein above noted traverses the stone 

 in the form of an irregular fissure (often expand- 



Natural size. 



mg and contracting abruptly as is shown in figure 



6G mm , 



2), for a distance of about 

 width from a mere line up to 



in.' 



and varies m 

 Near its lower 



end it bifurcates and encloses a portion of the mass of the 



by 2 mm wide.* From a fragment 



meteorite some 15 T 



long 



* Since the above was written Messrs. Ward and Howell 

 through the center and published in Science of June 1, 1888 

 full extent and width of the veins. 



have sliced the stone 

 a figure showing the 



