G. If. Kimz — Meteoric Iron from New Mexico. 235 



lines of the enlargements are noticeable. At points where 

 the lines are not thus serrate the grains have grown until in 

 contact with other grains of hornblende or feldspar. It will 

 be noticed that the cleavage is continuous in places from the 

 inner into the outer hornblende, while at times these cleavage, 

 lines break abruptly at the division line between the old and 

 new material. This fact alone is an almost decisive proof that 

 the exterior and interior parts of the individuals are of the 

 same nature, and that the growth of the whole has been an 

 interrupted one. The regular, worn, rounded outlines of the 

 interior parts show that this interruption has been a great one. 

 It will be noticed that the enlargements are narrow or wanting 

 in the direction transverse to this cleavage. This cleavage direc- 

 tion, as is well known, is that in which hornblende individuals 

 commonly have their greatest length. It is most often the case 

 that the entire enlargements have occurred in the direction of 

 the greatest magnitude of the particles of hornblende. 



Figure 3 shows an enlarged, crystal-outlined grain of horn- 

 blende. These crystal-outlined grains are sparsely present in 

 many of the sections from the conglomerate at Ogishke Muncie 

 and Cacaquabic Lakes, but are commonly enlarged. The en- 

 largements themselves never have crystal outlines. How it 

 chances that such grains occur in a clastic rock, I leave for 

 another to discuss. In figures 1, 2, and 3 all lines are struc- 

 ture or form lines. 



Figures 4 and 5 represent enlarged twinned crystals of horn- 

 blende. Parts of like shading in each case represent parts 

 which become dark simultaneously in polarized light. It is 

 plain that twinning bands cut through the lines which separate 

 the clastic cores and newly formed hornblende. The cleavage 

 lines, which are not shown in the figures, are parallel to the 

 greatest length of the grains. These grains then also represent 

 the tendency to enlarge in this direction as mentioned above. 

 They also show finely the sharply angular outlines of the added 

 hornblende. 



Art. XXXI. — On three Masses of Meteoric Iron from Glorieta 

 Mountain, near Canoncito, Sante Fe County, New Mexico ; by 

 George F. Kunz. With four Plates. 



The meteorite, described in this paper, was discovered by 

 Mr. Charles Sponsler, a prospector, and was supposed by him 

 to be a mineral of peculiar value. It was found on some un- 

 claimed land on Grlorieta Mountain, about half a mile from a 

 house in the woods, one mile northeast of Canoncito, Sante Fe 

 County, in May (?), 1884. The mass was lying on a rock, 



