PALLASITE. 73 



Since this specimen wns figured and the plate in the hands of the lithographer, A. 

 Weisbach's account of it, with the accompanying beautiful plate, has been received.* 



This plate, so far as the writer can judge, shows the structure exceedingly well, and, 

 like the two figures drawn by him, indicates tlie two types of structure iu this meteorite. 

 In one it shows the sponge-like character of the iron, holding the silicates in detached 

 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 the detached 

 pieces of iron, but it is discontinuous. 



A microscopic examination of this meteorite has been made by Tschermalc, who 

 states that the asmanite is tridymite, and that the meteorite is composed of meteoric 

 iron, bronzite and tridymite.f 



Breiicnhach, 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, aud inclosing in its cells broiffeite (enstatite), asmanite (tridymite), and chro- 

 mite. 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. 



Steinbach, Saxony. 



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. 



Atacama, Chili. 



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 ii'regular sponge-like mass of iron holding gi-ains 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 Chaco, Aiacama, Chili. 



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

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

 numerous inclusions, of bronzite, pale brownish glass, parallel layers of fine black 

 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 grains, 

 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. 



* Dev Eisenmeteorit von Hittersgriin ini s'achsisclien Erzgebirge, Freiberg, 1876 ; 3 pp. and plate. 



t Sitz. Wien. Akad., 1S83, Ixxxviii. (1), 3i8. 



+ Phil. Trans., 1S71, pp. 359-365. 



§ Am. Jour. Sci., 1S64 (2), xxxvii. 243-248. 



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