204 BULLETEN 184, UNITED STATES NATIONAL MUSEUM 



Octibbeha County ^ meteorite, 47, 62, 68, 



115, 151, 154. ' 

 Odessa! meteorite, 115, 164. 

 Olivine, 25. 



Osseo ' meteorite, 17, 54, 65. 

 Otumpa^ meteorite, 17, 18, 36, 54, 65, 



69, 115, 164, 166, 168. 198. 

 Oxides, 24, 73-75. 



Pallasites, 25. 



Paraeutectoid structures, of ataxites, 46, 

 50, 58, 67-69, 73, 81. 



of iron-nickel system, 36, 38, 40, 

 67-69. 



of plessite, 47. 

 Paraeutectoids, relation of eutectoids to, 



30, 36, 82. 

 Pearlite, cementite in, 29, 33, 39. 



definition of, 29. 33, 39. 



ferrite in, 2, 9, 33, 39. 



in iron-carbon system, 29, 33-36, 46, 

 85. 



in meteorites, 36. 

 Phase changes, in alloys, 30. 



in iron-carbon alloys, 32. 



in iron-nickel alloys, 36. 

 Phase equilibrium, 30-32, 35, 44, 59, 67, 



69. 

 Phases. (See Eutectics, eutectoids; 



Paraeutectoids; Transformation.) 

 Phosphide. (See also Iron phosphide; 

 Phosphorus.) 



as rhabdites, 53, 72, 78-81. 



diffusion of, 20, 72, 78. 



etching for, 99, 101. 



in kamacite, 80, 89. 



in schreibersite, 18-20, 77, 78. 



in taenite, 15, 78. 



in troilite, 78. 



inclusions of, 50, 52, 53, 81. 

 Phosphorus, 77. (See also Schreiber- 

 site.) 



effect of on phase transformation, 

 69, 80, 81. 



in ataxites, 80-83. 



in sheen, 12. 



in the Cape iron, 82, 



influence on plessite, 67, 81, 82. 



role of, 77. 



spectroscopic analysis of, 104. 

 Photography, 93, 95, 102. 

 Pine River I meteorite, 115, 127, 161, 



162, 176, 177, 

 Pitts' meteorite, 93. 

 Plessite, 65. 



black, 15, 16, 55, 56 (see also dense). 



dark (see dense). 



definition of, 5, 8, 15, 65, 66. 



dense, 15-17, 46, 47, 66, 67, 70, 72, 

 82. 



eutectoid of, 82. 



genesis of, 46, 65-69. 



in ataxites, 47, 65-67, 69, 70. 



in hexahedrites, 17, 53, 54, 65. 



1 Octahedrite. 

 ' Atasite, nickel-rich. 

 ' Hexahedrlte. 

 <Ataxlte, nickel-poor. 



Plessite — Continued. 



in octahedrites, 5, 6, 8, 15-17, 46, 



47, 65-69. 

 in trias, 47. 

 in two-phase equilibrium structure, 



67. 

 influence of phosphorus on, 67, 81, 



82. 

 kamacite in, 15, 16. 

 light, 15, 16, 47, 66, 67, 70. 

 nickel in, 38, 103. 

 normal (see light), 

 taenite in, 15, 47, 69. 

 Vogel's views on, 66. 

 Polishing. (See Micropolishing.) 

 Polysynthetic twinning. (See under 



Twinning.) 

 Prambanan i meteorite, 10. 

 Puquios 1 meteorite, 92. 

 Primitiva* meteorite, 7, 61, 115, 130, 



198. 

 Proportions of meteoric types, 8. 

 Pyroxene, 25. 



Rafriiti ^ meteorite, 71. 

 Ragged structure, 62. 

 Rasgata * meteorite, 63. 

 Reagents, etching, 97, 98. 

 Reed City ' meteorite, 74. 

 Reheating, natural, 50, 59, 71-73, 75. 

 Reichenbach lamellae, 17, 87. 

 Rhabdites, definition of, 19, 



in hexahedrites, 19, 52, 53, 72. 



in kamacite, 60. 



of schreibersite, 18. 



phosphide in form of, 53, 72, 78-81. 

 Rio Loa^ meteorite, 76, 79, 115, 129, 



173, 178, 179. 

 Roebourne ^ meteorite, 66, 115, 160. 



Sacramento Mountains ' meteorite, 91. 



Salina ' meteorite, 115, 197. 



Sanchez Estate ^ meteorite, 121. 



San Cristobal 2 meteorite, 36, 39, 65, 68, 



80, 115, 134, 137, 149, 150, 165. 

 Sandia Mountains^ meteorite, 115, 121. 

 San Francisco del Mezquital'* meteorite, 



61, 115, 188, 197, 198. 

 San Francisco Mountains' meteorite, 66, 



115, 160, 191. 

 Santa Catharina ^ meteorite, 39, 47, 68, 



115, 151, 153. 

 Santa Luzia de Goyaz' meteorite, 64, 



115, 121, 122, 124. 

 Santa Rosa* meteorite, 63. 

 Savannah' meteorite, 21. 

 Schreibersite. (See also Phosphorus.) 

 alteration of by heat, 20, 71, 72, 



78, 79, 91. 

 association with graphite, 19. 

 association with kamacite, 13, 87. 

 association with troilite, 19, 78. 

 cobalt in, 20. 



composition of, 17, 18, 20, 77. 

 genesis of, 81. 



