March, 1907. Iron Meteorites — Farrington. 



73 



drites, while graphite and diamond are also largely confined to the 

 octahedrites. Daubreelite and chromite, which are common con- 

 stituents of the hexahedrites, are rare in the octahedrites. The 

 nickel-cobalt content of the octahedrites varies from 5^ to JSH 

 per cent. 



A. NORMAL OCTAHEDRITES. 



In the normal octahedrites the lamellar structure extends without 

 change of direction, except for occasional curving, through the indi- 

 vidual. This is true e^^en for large masses like those of Charcas, 

 Chupaderos, and Willamette. 



I. COARSEST OCTAHEDRITES. 



^vidth of lamellne from many millimeters down to 2.5 mm. The 

 nickel-cobalt content is as a rule slightly higher than in the hexa- 

 hedrites, reaching in some cases 7 per cent. The presence of cohen- 

 ite and graphite is characteristic of the group. Canyon Diablo con- 

 tains diamond. The octahedral structure and presence of lamellae 

 is often difficult to discern, so that some members of the group 

 have been classed as hexahedrites. 



)C 1 AHE])RITES. 



Undet, 



Total 



99-31 



99-719 



99.983 



9Q-3I 



100.00 



99.67 



g8.32 



100.87 



98.34 



98.89 



97.92 



98.74 



100.00 



Sp. Gr. 



7-853 



7-703 



7-74 



7-952 



7-952 



7-783 



7.63 -7.71 



7-73 



Analyst. 



J.E.Whitfield 



H. Moissan 



Booth.Garrett & Blair 



H. N. Stokes 



Mariner & Hoskins. . 



J. L. Smith 



F.A. Genth 



O. Hildebrand 



C. T. Jackson 



C. V. Bonhorst 



A. Duflos 



C. Rammelsberg. . . . 



Reference. 



1902, Proc. Roch. Acad. Sci., W, 85 



1904, Comptes Rendus, CXXXIX, 776 



1905, Proc. Phil. Aca. Sci., LVII, 875 

 1895, A. J. S. (3), L, 252-4 



1900, A.J. S. (4), IX, 286 

 i860, A.J. S. (2), XXX, 240 

 1876, A.J. S. (3), XII, 72-73 



1903, Mitt. f. Neil Vorp. u. Rligen, XXX\',4 

 1863, A. J. S. (2), XXXVI, 261 



1863, A.J. S. (2), XXXVI, 261 



1888, Neues Jahrb., 372 



1848, Ann.Phy. Chem., LXXIV, 61-65 



1848. Ann. Phy. Chem., LXXIV, 443-448 



