Metallic portion, 

 51.031 per cent 



Nonmetallic portion, 

 48.969 per cent 



156 BULLETIN 9*, UNITED STATES NATIONAL MUSEUM. 



(3) One from Breitenbach, weighing 53.7 grams. The three localities 

 mentioned are but about 1 mile apart, and the stones regarded as part 

 of one and the same fall. Date of fall unknown — perhaps 1540. The 

 Steinbach sample found previous to 1751; that of Kittersgriin in 

 1847; and that of Breitenbach in 1861. 



The chemical and mineralogical composition of the Rittersgriin 

 material has been investigated by Weisbach and by Winkler. Ac- 

 cording to the latter, the mineral composition and its relative propor- 

 tions are as follows : 



Per cent. 



/Nickel iron (FciNi) 50.406 



Phosphor-nickel-iron (FeNi4P)- .149 



Pho.sphide of iron ( FesP ) . 274 



Silicide of iron ( FCiSi ) . 169 



Sulphide of iron ( FeS ) . 015 



Carbide of iron Trace. 



Copper . 018 



Troilite 7. 211 



Asmanite 8. 527 



Bronzite. 32. 908 



Chromite . 323 



Analyses of the troilite, asmanite, nickel-iron, and the bronzite 

 are also given. It was in this meteorite that the English mineralogist 

 Maskelyne found the rhombic form of silica to which he gave the 

 name Asmanite, 



References. — N. Story-Maskelyne, Proc. Royal Soc. London, vol. 17, 

 1869, p. 370; vol. 19, 1871, p. 266; Philos. Trans., vol. 161, 1871, pp. 

 161 and 212. A. Weisbach, Verl. k. Berg-akad. ; Verb, naturh. Ver. 

 Bonn, vol. 33, 1876, p. 92. C. Winkler, Nova Acta k. Leop. Karol. 

 Akad., vol. 40, 1878, p. 333. 



TADJERA, SETIF, CONSTANTINE, ALGEKIA. No. 286. 



Stone, Ct. Fragment from interior, weighing 75 grams, from one 

 of two masses, weighing 8,843 grams, which fell on June 9, 1867. 

 Meunier described the stone as consisting of : 



Per cent. 



Soluble silicates (mainly olivine) 50.40 



Insoluble silicates (mainly pyroxene) 33.08 



Chrome-iron . 20 



Troilite 8. 04 



Nickel-iron 8. 32 



100. 04 

 Reference. — Daubree, Compt. Rend., vol. 66, 1868, p. 513. 



TAZEWELL, CLAIBORNE COUNTY, TENNESSEE. No. 63. 



Iron, Off. Weight, 152 grams. Date of fall unknown: found in 

 1853. Weight of original mass, 25 kilograms (55 pounds), according 



