44 MERRILL AND STOKES 



stone is seen to be made up of the chondrules, iron, and dark 

 gray silicate materials, imbedded in a light gray, ashy ground- 

 mass. 



The stone is exceedingly friable, crumbling away readily be- 

 tween the thumb and fingers. Indeed it is pronounced by Dr. 

 Merrill to be without exception the most friable meteorite that 

 has come to his attention. Naturally it is beautifully fresh and 

 free from all oxidation products. 



Examined under the microscope, in thin section, the stone 

 exhibits in a very marked degree the granular fragmental struc- 

 ture which sometimes characterizes chondritic meteorites, as 

 those of Gopalpur, San Miguel, etc., and which is regarded by 

 Tschermak and some other authorities as indicative of a tuffa- 

 ceous origin. Three types of chondrules are noted : first, the 

 ordinary enstatite chondrules showing the eccentric, fan-shaped 

 structure, too well known to need further description (PL V, 

 figs. 3 and 4) ; second, those composed of olivines, sometimes 

 quite idiomorphic, developed in a black glass (PL V, fig. 6) ; 

 and, third, those which are apparently of enstatite but almost 

 completely structureless (PL V, figs. 5, 7 and 9); these last 

 form the greenish chondrules referred to above. There are 

 also occasional olivine chondrules showing the barred or grate 

 structure. 



As already noted, some of these chondrules are beautifully 

 spherical and others are in the form of elongated blebs (PL IV, 

 figs. I and 2). They are sharply differentiated in most cases 

 from the groundmass and break away so readily as to make the 

 preparation of satisfactory thin sections extremel}' difiicult. 

 When isolated they often show one or more shallow concavities, 

 such as might be formed by the pressure of one against another, 

 but no two were found in such contact as to produce this result 

 (PL IV, fig. I). Similar concavities have been noted by 

 Tschermak and Makowsky in chondrules from the Tie- 

 schitz (Moravia) meteorite.' Many of the enstatite chondrules 

 are distinctly fragmental in outline (PL IV, figs. 3-7), 

 and none of them show a holocrvstalline internal structure. 



'Denkschriflen Kais. Akad. dcr Wissenschafteii, Math. Nat. Classc, B. 39, 1S79, 

 P- 195- 



