200 



BULLETEN 184, UNITED STATES NATIONAL MUSEUM 



Brinnell hardness, 14. 



Burlington i meteorite, 62, 114, 193. 



Butler 1 meteorite, 8, 39, 114, 132, 133. 



Canton ' meteorite, 61, 114, 155. 

 Canyon Diablo ' meteorite. 21-23, 25, 



73, 92, 114, 183, 184, 195. 

 Cape of Good Hope - meteorite, 7, 68, 



73, 82, 83, 114, 142, 144. 

 Cape York ^ meteorite, 114, 127. 

 Carbide. (See also Carbon.) 



etching for, 99-101. 



iron, or cementite, 26. 



iron-nickel, 23. 



or cohenite. 21, 22, 83. 

 Carbon, 21, 83. (See also Carbide; 

 Iron-carbon alloys.) 



eutectic proportion of, 29. 



free, or graphite, 21, 26, 52, 83. 



in artificial irons, 26, 28, 32-36. 



in hexahedrites, 21. 



in iron alloys, 26, 28, 32-36. 



in meteoric irons, 21, 77, 83-85. 



in steel, 26, 33. 



ratio in production of cementite, 22. 

 Carlton ' meteorite, 8, 74, 114, 123, 133. 

 Casas Grandes ' meteorite, 83, 114, 127. 

 Cedartown ^ meteorite, 71, 79, 80, 114, 



124, 169, 171, 175, 182. 

 Cementite, calculation of, in relation to 

 cohenite, 22. 



in artificial iron, 21-23, 26. 



in iron-carbon system, 26, 32, 34, 35. 



in pearlite, 29,"^ 33, 39. 



or iron-carbide, 26. 



properties of, 22. 



spheroidizing of, 69. 



tests for, 84. 

 Cementite and ferrite eutectoid, 29, 33, 



35, 39. 

 Central Missouri ^ meteorite, 52, 64. 

 Chesterville ^ meteorite, 75, 76, 79, 85, 



92, 114, 129, 179, 186. 

 Chromite, 25. 

 Chrysohte, 25. 

 Cincinnati * meteorite, 79, 81, 114, 130, 



179. 

 Classification. (See Meteorites, classi- 

 fication.) 

 Cleavage, false, 5, 49. 



in ataxites, 76. 



in hexahedrites, 4, 5, 49, 



in kamacite, 4. 

 Cleveland ^ meteorite, 114, 161, 164. 

 Coahuila ^ meteorite, 10, 18, 114, 121. 

 Cobalt. (See also Nickel-cobalt.) 



effect of, on transformation, 9, 44. 

 • in cohenite, 21. 



in hexahedrites, 4. 



in iron-nickei. system, 44. 



in schreibersite, 20. 



separation of, from nickel",' 9. " 



' Octahedrite. 



' Atasite, nickel-rich. 



' Ilexahedrite. 



' ,\taxite," ilickel-poor. 



Cohenite, calculation of, in relation to 

 cementite, 22. 



cobalt in, 21. 



crj'stallization, 21. 



in meteoric iron, 17, 21, 22, 83. 



in octahedrites, 21, 23. 



nickel in, 22, 23. 



occurrence of, 22. 



properties of, 22, 23. 



tests for, 23, 24, 84, 99-101, 103, 

 105. 

 Cold-working, 13, 14, 69. 

 Constituents, accessory, 17. 



minor, 25. 



primarj^ 10. 

 Cookeville ' meteorite, 114, 187. 

 Copiapo ' meteorite, 123. 

 Cosby Creek' meteorite, 21, 22, 114, 



184. 

 Cowra Creek - meteorite, 7, 46, 65, 68, 



79, 114, 133-135, 137, 138, 174. 

 Critical points, thermal, 27, 28. 

 Crystallization, dendritic, 49, 74. 



of daubreelite, 18. 



of troilite, 18, 53, 87. 



in cohenite and schreibersite, tests 

 for, 105. 



in meteorites, 48, 49. 



in octahedrites, 49. 



Daubreelite, crystallization of, 18. 



in hexahedrites, 18, 52, 53. 



properties of, 18. 



tests for, 18, 103. 

 Deep Springs ^ meteorite, 58, 68, 83, 



114, 141, 188. 

 Deformations, 88, 92, 93. 

 Delta-gamma transformation. (See un- 

 der Transformation.) 

 Dendrites, 49, 74. 



Desotoville^ meteorite, 114, 125, 187. 

 Diamonds, 25. 

 Displacements, 92, 93. 

 Dungannon ' meteorite, 21, 75, 90, 91, 

 114, 182. 



Eisenglas, 24, 73. 



El Burro ' meteorite, 64. 



El Inca ' meteorite, 92. 



Equilibrium. (See Phases.) 



Etching. (See under Techniques, me- 



tallographic.) 

 Eutectic proportion of carbon, 29. 

 Eutectics, eutectoids, definition of, 29. 

 in schreibersite, 77. 

 nickel in, 82. 

 of alloys, 29, 30, 34. 

 of ferrite and cementite, 2, 9, 33, 



35 39 

 of iron-phosphide, 20, 21, 59, 72, 



77, 79, 80, 82. 

 relation of, to paraeutectoid struc- 

 ture, 30, 36, 82. 

 revealed by etching, 3, 63, 77. 

 supposed, 38. 



