10 PROCEEDINGS OF THE NATIONAXr MUSEUM vol.72 



Analysis of Coldicater Meteorite 



By J. E. Whitfield 



Insoluble 3. 361 



SiOa 2. 910 



AI2O3 1. 610 



FesOa 81.595 



P2O5 . 621 



CuO . 038 



NiO 1.999 



CoO , . 113 



MgO , . 331 



SO3 . 219 



H2O 7. 205 



100. 002 



Disregarding the minor constituents and calculating the oxides 

 on a combined basis this analysis gives: 



Llmonite (2Fe203.3H20) 49.89 



Magnetite (FeO.Fe203) None. 



Trevorite (NiO.Fe^Os) 6.22 



Co trevorite (CuO.Fe^Os) .35 



Cu trevorite (CuO.FeiOa) .12 



Hematite (Fe^Os) 34.36 



90.94 



Since the above analysis showed no value for ferrous iron it was 

 not known whether the state of oxidation had been directly deter- 

 mined or whether the whole of the iron had been presumed to be in 

 the ferric state. Another portion of the specimen was accorded 

 partial chemical examination in the United States National Museum 

 laboratory. This material was blackish-brown in color, compact, 

 and with a somewhat metallic luster, especially on polished surfaces. 

 Fairly large pieces are easily lifted by a hand magnet. The result 

 of this partial analysis was as follows : 



Insoluble 5. 02 



FeaOs . 75. 12 



FeO 1. 77 



NiO 4.32 



H2O 12. 38 



98.61 



The last analysis, interpreted in mineralogic terms gives the 

 following : 



Magnetite (FeO.Fe^Os) 5.70 



Trevorite (NiO.Fe^Os) 13.44 



Limonite (2Fe203.3H20) 85.86 



105. 00 



