PALLASITE. 7:j 



Since tliis spficiineii was figured and the plate in the Ijands of the lithf»graphor, A. 

 AVeisbach's account of it, with the accompany in;^ beautiful plate, Ijas l*een received.* 



This plate, so far as the writer can judf,'e, shows the structure exc»'editi;<ly well, and, 

 like the two figures drawn by him, indicates the two types of structure in this mettorite. 

 In one it shows the sponge-like character of the in^n, holding *.he silicates in detacherl 

 grains and masses ; in the other the iron appears to be in the detached grains lying in 

 the mass of silicates. The sponge-like structure shows, however, in all th<i d.La. l,..d 

 pieces of iron, but it is discontinuous. 



A microscopic examination of this meteorite has been made l>y Tscherniak, who 

 states that the asmanite is tridymite, and that the meteorite is composed of ni(;t»'oric 

 iron, bronzite and tridymite.f 



Brcitcnhach, Bohemia. 



The pallasite from Breitenbach was described by Prof. N. S. Maskelyne in 1871. 

 This was seen to be composed of a sponge-like mass of nickeliferous iron with some 

 pyrrhotite, and inclosing in its cells bronzite (enstatite), asmanite (tridymite), and chro- 

 mitc. No complete analysis has been made.J 



If this is, as has been claimed, the same as the Eittersgriin pallasite, the microscopic 

 section of that rock given by Fouque and Levy would indicate that its composition was 

 considerably different from that given by Maskelyne. 



Stcinhach, Saxon?/. 



The structure of this is the same as that from Eittersgriin, and these two with the 

 Breitenbach pallasite are supposed to be portions of the same mass. 



Afacama, Cliili. 



To the pallasites also belongs a meteorite found on a mountain pass, in the province 

 of Atacama, Chili, which was described by Prof. Charles A. Joy. This rock seems to be 

 composed of an irregular sponge-like mass of iron holding grains of olivine and enstatite 

 or labradorite, most probably the former. § 



The analysis given by Professor Joy is apparently the best and most complete yet 

 made of any of the pallasites. 



Sierra de ChacOy Atacama, Chill. 



According to Tschermak, this is composed of an iron sponge, containing grains of iron 

 and silicate. Plagioclase, with broad twin lamelhe, is quite abundant, and contains 

 numerous inclusions, of bronzite, pale brownish glass, parallel layers of tine l)lack 

 needles, etc. Besides the plagioclase, there were seen greenish grains of bronzite, green- 

 ish-gray rounded grains of olivine, with dust-like inclusions, brownish augite gniins, 

 colorless particles of tridymite, some supposed cordierite, and a brownish glass. This 

 is considered by Tschermak to be the same pallasite as that analyzed by Joy from 

 Atacama. 



* Der Eisenmcteorit von Eittcrsqriiii im saclisischeu Erzgebirge, Freiberg, 1876 ; 3 \)\^. and plate. 



t Sitz. Wicn. Akad., 1S83, Ixxx'viii. (1), 319. 



X Phil. Trans., 1871, pp. 359-365. 



§ Am. Jour. Sci., 1864 (2), xxxvu. 2«-21S 



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