44 BULLETIN 94, UNITED STATES NATIONAL MUSEUM. 



ceous portion of the stone was made up of 95.011 per cent chladnite 

 and 4.985 per cent of labradorite. Eammelsberg, in 1863, declared, as 

 a result of his examination, that the stone contained no feldspar. In 

 1883, the stone was studied by modern petrographic methods by M. E. 

 Wadsworth, who agreed with Shepard in describing it as a grayish- 

 white mass resembling albitic granite, with brown and black spots 

 and with a structure essentially granitic. The mineral composition 

 as given is as follows: Enstatite, augite, feldspar, olivine, pyrrhotite, 

 and iron. No perfectly satisfactory chemical analysis of the stone as 

 a whole has until recently been made, those of Shepard, Smith, Rose, 

 and Eammelsberg being all on selected siliceous material. Recent 

 results by J. E. Whitfield are as below : 



Per cent. 



Silica (SiO.) 57.034 



Alumina (AI2O3) 1.706 



Ferric oxide (Fe^O^) 1.406 



IMangnnons oxide (MnO) .189 



Lime (CaO) 2.016 



Magnesia (MgO) 33. 506 



Cobalt oxide (CoO) Trace 



Nickel oxide (NiO) .538 



Soda (Na.O) 1.027 



Potash (K2O) .089 



Ignition (H2O) 1.995 



Iron (Fe) .181 



Nickel (Ni) .039 



Sulphur (S) , .297 



100. 023 

 Less O for S . 147 



99. 876 



An amount of lime equivalent to 0.G7 per cent calcium sulphide 

 was liberated by boiling the finely pulverized stone for two hours in 

 distilled water. Inspection of the stone in mass shows, in addition, 

 occasional granules of an iron sulphide (troilite or pyrrhotite) which 

 were evidently not included in the portion analyzed. No traces of ba- 

 rium, strontium, or zirconium could be detected. The amount of ma- 

 terial utilized in the analysis was not as large as could have been 

 desired. 



References. — See Wiilfing, p. 30. Also G. P. Merrill, Mem. Nat. 

 Acad. Sci., vol. 14, 1916, p. 7. 



BITBURG (ALBACHER MijHLE), RHENISH PRUSSIA, GERMANY. Nos. 122, 445. 



Stony-iron, Pallasite. Irregular slag-like mass, weighing 22 grams, 

 and polished and etched slice, some 35 by 35 by 20 mm., showing 



