No. 1.) 



RESEARCHES ON METEORITES— MERRILL. 



19 



The mineral composition so fax as determined by analysis and microscopic examination is: 



Per cent. 



Silicate (enstatite) 74.42 



. Metal 11.50 



Troilite 13. 296 



Oldhamite 596 



Graphite 31 



100. 122 

 Specific gravity, 3.42. 



(14) Meteoric stone, Eukrite (Eu). — Jnvinas, France. This stone has been widely circulated 

 and is represented iii aU the collections of importance throughout the world. As a result it 

 has been made the subject of numerous memoirs and briefer notices, Wiilfing recording forty- 

 seven titles in his catalogue. I find, however, no recorded analysis later than that quoted 

 below, which dates back to 184S. In view of this, and the additional fact that it is a feld- 

 spathic stone, it seemed worth the while to give it consideration here with especial reference 

 to the possible occurrence of barium, strontium and zirconium. Wadsworth, in his review of 

 the mineralogical- determiuations made by Rammelsberg, Tschermak, and others, states that 

 the stone consists of anorthite and augite with small amounts of pyrrhotite and nickel-iron. 

 Rammelsberg noted chromite and ilmenite, whQe Fouque and Levy detected also enstatite. 



In Column I below are given the results obtained by Whitfield and in II those of Rammels- 

 berg. 



The amount of metal was so small as to make it practically impossible to determine the 

 proportional amounts of nickel, cobalt, and iron. The SO3 and a part of the FcjOj were doubt- 

 less derived from the iron sulphide through oxidation, and have so been considered in the final 

 tabulation. Tests were made for oldliamite by boUing the powdered material in water, but 

 no calcium could be detected. The absence of chromium in Whitfield's analysis is doubtless 

 due to the sporadic occurrence of the mineral chromite and the small size of the sample sub- 

 mitted, but 9 grams being available. 



(15) Meteoric stone, BlacJc Chondrite (Cs). — McKirmey, CoUin County, Tex. Referred 

 to by Brezina" and relegat<?d to his Cs type, characterized by colorless chondrules firmly 

 imbedded in a dark gray to black ground. The mineral composition and structure are given, 

 but no analyses. Dr. Whitfield found the stone to consist of: 



Per cent. 



Troilite 6.26 



Schreibersite .58 



Metal 5. 70 



Chromite .11 



Silicate minerals 87. 35 



100.00 



o Ann. k. k. Holmus., Band 10. Heft 3 u. 4, 1895 (96), p. 252. 



