Kunz and Weinsclietik — Two Meteoric Irons. 425 



The structure of this meteorite is very interesting, as it lies 

 between the so-called breccia and hexahedral irons. Even on 

 the unetched polished sides it is possible to identify the crystals 

 of schreibersite arranged in bands lying parallel to the Neumann 

 lines, which on the larger part of the mass are as well devel- 

 oped as in the Coahuila iron. Some parts of the piece exhibit 

 a granular structure identical with that of Chattooga County. 



As the Chattooga County meteoric iron was erroneously 

 referred to the Coahuila iron by a writer* who had not seen 

 the mass, the writers feel it their duty to rectify this, and to 

 state that Chattooga County is over fifteen hundred miles north- 

 east from where the nearest of the Coahuila masses was found. 



It is a question whether the granular structure is the orig- 

 inal structure out of which hexahedral particles were formed 

 through re-crystallization, or whether it is due to the fact that 

 this iron, not being rich in nickel, has a lack of crystallizing 

 power ; and it is impossible to decide. In any case this iron is 

 not rich in nickel and cobalt. 



The thanks of the writers are due to Mr. Walter Wood, of 

 Philadelphia, for his courtesy in assisting one of us to obtain 

 this meteorite and to ascertain the facts of its discovery. 



2. Sierra de la Ternera, Province of Atacama, Chile. 



This meteorite was kindly loaned to us by Dr. Morieke, of 

 Stuttgart, Germany, who obtained it on a trip in Chile, with 

 the information that it was found in the Sierra de la Ternera. 

 The specimen is an elongated mass, and although small — 

 weighing but 650 grams, — is undoubtedly the entire meteorite, 

 as the unbroken original crust, beautifully preserved, and 

 entirely covered with deep finger-like markings, would indi- 

 cate. 



Having received permission from the owner, one end was 

 cut and polished ; it was then found that dilute nitric acid 

 scarcely attacked the iron, and only after heating was it pos- 

 sible to obtain distinct etching. The figures, however, were 

 not characteristic. The ground-mass of this iron indicates a 

 very compact structure on which there is to be observed a 

 peculiar moire sheen, although this is not the character of the 

 " Cape Iron," which it more nearly resembles, being a much 

 more grained surface and by strong etching becomes easily 

 dull. In this ground-mass are to be seen fine short sharply- 

 drawn lines, which from their luster are very prominent. They 

 are evidently not rhabdites, but are probably lamellae of a nickel- 

 iron mixture. In the chemical analysis, 0*44915 grams of this 



* Proe. Amer. Acad. Arts and Sciences, Oct. 10, 1S88, p. 34. 



