172 BULLETIN 94, UNITED STATES NATIONAL MUSEUM, 



Per cent. 



Silica (SiO.) 41.00 



Ferric oxide (FeaOs) 45.00 



Alumina (AUO3) .75 



Magnesia (MgO) 14.9 



Lime (CaO). 2.00 



Nickel (Ni) 1.00 



Chromium (Cr) .75 



Sulplnir (S) 4.00 



109. 40 

 Gift of E. (le Krontschoff. 

 Reference. — Laiigier, Gilbert's Annalen, vol. 75, 18'23, p. 204. 



ZACATECAS, MEXICO. No. 57. 



Iron, Obz. Weight, 14.8 grams. Date of fall unknown; found in 

 1792. Oj'iginal weight some 1.000 kilograms. According to Berg- 

 mann, as quoted by Buchner (p. 145) , this iron consists of 93.77 nickel- 

 iron, 2.27 pyrrhotite, 1.48 chromite, 1.G5 schreibersite, and 0.49 carbon. 



Gift of J. Berrien Lindsley. 



ZAVID, BOSNIA, AUSTRIA. No. 232. 



Stone, Cia I ?). Weight, 31 grams. Irregular fragment from the 

 interior. Fell August 1, 1897, about 11.30 a. m. Four stones were re- 

 ported. The largest, which was broken, was estimated to have 

 weighed 90 kilos; the others weighed 2.542 kilograms, 220 grams, and 

 48 grams, respectively, a total of 92,810 grams. General direction of 

 flight southeast to northwest. A moderately firm, ilidistinctl}^ chon- 

 di'itic stone, of a light gray color, in which the metallic particles are 

 so small as to be scarcely distinguishable by the unaided eye. 



The mineral composition, according to Berwerth, is olivine, bron- 

 zite, a monoclinic pyroxene, a little plagioclase, chromite, pyrrhotite, 

 and nickel-iron. Analyses by Carl Hodlmoser yielded : 



Per cent. 



Ignition (H=0) 0.39 



Silica (SiO.) 41.90 



Alumina (AUOa) 1.92 



Iron (Fe) .15 



Ferrous oxide (FeO) 27.40 . 



Cobalt (Co) Trace. 



Nickel (Ni) - Trace. 



Manganese (Mn) Trace. 



Lime (CaO) 4.60 



Magnesia (MgO) 22.79 



Soda (NaoO) 1.05 



Potash (K2O) .41 



Sulphur (S) 1.01 



101. 62 

 Less O for S • 51 



101. 11 



