METEORITES OF NORTH AMERICA. 401 



cavity or pitting 4 inches in diameter and 1 inch or more in depth, while numerous smaller pittings could have been 

 created in the same way as suggested by following the outline of the fissures on cut. 



The following is an analysis of the San Angelo meteorite by Mariner and Hoskins of Chicago, Illinois: 



Fe Ni Co Cu P S Mn Si C 



91.958 7.86 trace 0.04 0.099 0.032 trace? 0.011 trace =100 



Specific gravity, 77. 



The meteorite is distributed. Ward possesses 4,516 grams. 



BIBLIOGRAPHY. 



1. 1898: Preston. San Angelo meteorite. Amer. Journ. Sci., 4th ser., vol. 5, pp. 269-272. (Cuts of mass and etching 

 figures.) 



Sancha Estate. See Fort Duncan. 

 Sanchez Estate. See Fort Duncan. 



SAN EMIGDIO. 



San Emigdio Mountains, San Bernardino County, California. 



Approximately latitude 35° N., longitude 116° W. 



Stone. Spherical chondrite (Cc) of Brezina; Belajite (type 44) of Meunier. 



Found prior to 1887; described 1888. 



Weight, 36 kgs. (80 lbs.). 



This meteorite was chiefly described by Merrill. 1 A brief account was given in the Amer- 

 ican Journal of Science and full details later in the Proceedings of the United States National 

 Museum, as follows: 



The fragments came into my possession through the kindness of Mr. Thomas Price, of San Francisco. The stone 

 is stated by Mr. Price to have been found by a prospector in the San Emigdio Mountains, San Bernardino County, 

 in the southern part of California, and to have been sent him for assaying, it being mistaken for an ore of one of the 

 precious metals. 



Unfortunately, before its true nature was discovered, the entire sample was put through a crusher, so that no speci- 

 mens of more than a few grains weight were obtainable. Nothing whatever can be learned in regard to the fall of the 

 stone, and its meteoric origin is assumed from its structure, composition, and the presence of the well-known black 

 coating on the exterior surfaces of many of the larger particles. The weight of the entire mass was stated by the finder 

 to be about 80 pounds. 



All the fragments are stained throughout a dull reddish-brown color, through the oxidation of the metallic por- 

 tions. The stone breaks with an irregular fracture, and presents on casual inspection nothing indicative of its meteoric 

 origin; a polished surface, however, shows abundant silvery -white flecks of metallic iron in sizes rarely over 1 mm. 

 in diameter, and numerous larger spherical bodies of a green color suggestive of olivine, never over 2 or 3 mm. in 

 diameter, however. 



In thin sections the true nature of this iron is at once apparent. Under a power of 50 diameters a large number 

 of rounded and irregular chondri and crystal fragments with scattering blebs of metallic iron and pyrrhotite, embedded 

 in a groundmass the true nature of which is so badly obscured by ferruginous stains as to be almost irresolvable, but 

 which, from a study of the thinnest slides obtainable, appear to be fragmental, are to be found. 



The readily determinable constituents, named in the order of their abundance, are olivine, enstatite (bronzite), 

 metallic iron, and pyrrhotite; there are also occasionally very minute fragments of an almost completely colorless 

 mineral, which between crossed nicols shows evidence of polysynthetic twinning. These are too small and irregular 

 for accurate determination, but from certain indefinite and obscure characters I have felt inclined to regard them as 

 belonging to a mineral of the pyroxene group rather than as a plagioclase feldspar. Their appearance resembles very 

 closely that of the twinned magnesian pyroxenes obtained by Fongue and Levy in artificial meteorites. 



Olivines occur in the form of both monosomatic and polysomatic chondri and as scattered fragments in the ground- 

 mass. The chondri show a variety of structural features. In certain cases they are made up wholly of crystalline 

 granules of olivine with scarcely a trace of amorphous matter, or, again, show well developed poqihyritic crystals 

 embedded in a very finely granular or even glassy base, or a very finely granular almost dustlike and very obscure 

 structure throughout. The porphyritic olivines are perfectly clear and colorless, with but few cavities or inclusions, 

 though sometimes including portions of its amorphous base. Forms are abundant resembling the polysomatic chondri 

 figured by Tschermak from sections of the Mezo-Madaras, the Homestead, and the Sena meteorites. They are not 

 in all cases circular in outline, as seen in the section, but are often irregular and fragmental in appearance. Mono- 

 somatic forms, as a rule, show a more nearly spherical outline than do the polysomatic forms. Occasional monosomatic 

 716°— 15 26 



