104 PERIDOTITE. 



similarity to the Iowa Co. meteorite, although the chondri are somewhat smaller. 

 Judging from the general characters of the Caharras meteorite, it is prohable that 

 Shepard's analysis is incorrect, and it is hoped a new one will be made. 



Other specimens of meteoric peridotites in the Harvard College Mineral 

 Cabinet, maci'oscopically examined by the writer, are : — 



Mew- 31(1 daras, Transf/Imnia. 



This shows a somewhat coarse chondritic structure, and contains grains of iron and 

 pyrrhotite. 



Alessandria, Piedmont. 



This has a grayish groundmass showing an hnperfect chondritic structure, and con- 

 tains considerable ii'on in grains and in films running through it. 



i?^Hrt.c.:0, Fcrrara, Ikdij. 



This has a dark surface or groundmass, holding graj'ish-white rounded grains or 

 chondri. Since this specimen shows no fresh fracture, but little can be said about its 

 characters. It resembles closely, in external appearance, some of the Cordilleran 

 andesites, possessing a dark, glassy groundmass holding rounded, glassy feldspars. 



This meteorite has been described before as similar to an obsidian-porphyry and 

 possessing a compact, black, enamel-like groundmass, holding numerous light-gray 

 spherules.* 



This meteorite ought to be studied microscopically, for it promises to be one of the 

 most interesting specimens examined by that method, and will probably throw much 

 light upon the origin of meteorites, especially if it should prove to be. as it appears, less 

 devitrified than other meteorites microscopically examined. 



Hartford, Linn Co., Iowa. 



This has a light-gray granular gi'oundmass showing chondritic structure, and is 

 sprinkled with metallic particles. 



Ausson, Haide Garonne, France. 



The specimen shows a gray groundmass, and possesses a well-marked chondritic 

 structure. 



Nanjemoy, Maryland. 



This is the same as the Ausson rock, except tliat its structure is of a finer character. 



Drake Creek, Sumner Co., Tennessee. 



This has a light-gray, fine-granular groundmass, sprinkled with iron in various forms. 

 This stone closely resembles that from Hartford, Linn Co., Iowa. 



* Buchner, Meteoriten in Sammlungen, 1S63, pp. 40, 47. 



