Pie KOULORMETEORITE: 
BY OLIVER CUMMINGS FARRINGTON. 
This meteorite is an iron mass found about 1852 by a goat-herder 
in an arroya north of the Nazas River, 12 kilometers northwest of 
the hamlet of Rodeo, State of Durango, Mexico. The location is 
approximately 25° 20’ N. lat. and 104° 40’ W. long. Upon discovery 
of the iron it was made to do duty as an anvil at a forge for many 
years. As received at the Museum, evidence of its industrial use 
was to be seen in its having been beaten flat and smooth on one side. 
The surface so treated is apparent in Plate I1., by its smoothness and 
turned-over edges. The meteorite as a whole is irregular in form 
and without marked orientation. Its extreme dimensions are 12 x 
9 x 8 inches (30x 23x 20 cm.). Its weight when received was 97 
pounds (44.1 kgs.). An attempt had evidently been made at some 
time to cut off a portion of the mass with a cold-chisel, thus producing 
the incision shown in Plate I. Above this a small surface appears 
that was filed smooth for etching. In other respects the surface of 
Pemsaetcorice: has’-the natural contours. The surface in general, 
though irregular, is everywhere rounded, showing no angular or 
sharp edges. There are many partially defined pittings of various 
depths and diameters, the largest of these having an elliptical out- 
line and being 4 inches (10 cm.) in length, 3 inches (8 cm.) in width, 
and about 1% inches (4 cm.) in depth. The position and character 
of this pit are shown in Plate I. In color the surface of the meteorite 
is darkened by exposure, but it has nowhere rusted deeply, and in 
several places the nickel-white color of the metal is visible. In such 
places Widmanstatten figures often can be seen also. On any pol- 
ished surface of the meteorite, too, the figures appear nearly as 
plainly as after etching. 
Several complete sections of the meteorite were made in order to 
determine its interior structure. All show on etching well-defined 
figures octahedral in character. A photograph of one of these etched 
sections is shown in Plate II]. The bands (Balken) are more numer- 
ous than the meshes (Felder), yet the latter occupy a considerable 
amount of the total area. Through a belt about two inches (5 cm.) 
in width running across the middle of most of the sections a minutely 
dotted appearance is presented resembling that described by Brezina 
I 
