irfNDEX. 



451 



0. 



Obsidian, 357. 

 Ocher, Red, 237. 



Brown or yellow, 239. 



Cerium, 206. 



Plumbic, 280. 



Uranic, 228. 



Chromic, 262. 

 Octahedrite, 211, (Anatase.) 

 (Erstedite, 202. 

 Oil, Genesee or Seneca, 96. 



Mineral, 95. 

 Okenite, 142. 

 Oligiste iron ore, 237. 

 Oligoclase, 179. 

 Oligon spar, 248. 

 Olivenite, 301. 

 Olivine, 156. 

 Onyx, 136. 

 Oolite, 116. 

 Opal, 139. 



Ophite, 145, (Serpentine.) 

 Ores, general remarks on, 202. 

 Orpiment, 226. 

 Orthite, 207. 

 Orthoclase, 176. 

 Ottrelite, 193. 

 Ouvarovite, 185. 

 Oxalate of iron, 249. 

 Ozarkite, 167. 

 Ozocerite, 97. 



P. 



Packfong, 265. 

 Paisbergite, 259. 

 PALLADIUM, 311. 

 Pargasite, 154. 

 Parisite, 206. 

 Peastone, 116, (Pisolite.; 

 Pearl spar, 119. 

 Pearlstone, 357. 

 Pectolite, 142. 

 Peloconite, 261. 

 Pennine, 149. 

 Periclase, 149. 

 Peridot, 156, (Chrysolite.) 

 Perofskite, 212. 

 Petalite, 182. 

 Petroleum, 95. 

 Phacolite, 170. 

 ^harmacolite, 226. 



Phenacite, 200. 



Phillipsite, 168. 



Phlogopite, 193. 



Pholerite, 162. 



Phonolite, 356. 



Phosphorite, 120. 



Phosphuretted hydrogen, 17. 



Photizite, 258. 



Phyllite, 193. 



Physalite, 194. 



Piauzite, 97. 



Pickeringite, 129. 



Picrolite, 146. 



Picrophyll, 331. 



Picrosmine, 149. 



Pimelite, 264. , 



Pinchbeck, 307 



Pinguite, 245. 



Pinite, 162. 



Pipe clay, 372. 



Pipestone, 358. 



Pisolite, 116. 



Pistacite, 183. 



Pitchblende, 228. 



Pitchstone, 357. 



Pitchy iron ore, 260, (Triplite.) 



Pittizite, 246. 



Plagionite, 302. 



Plasma, 136. 



Plaster of Paris, 114. 



Platin-iridium, 310. 



PLATINUM, 308. 



Pleonaste, 160 



Plumbago, 91. 



Plumbic ocher, 280. 



Plumbo-calcite, 117. 



Plumbo-resinite, 285. 



Polybasite, 327. 



Polycrase, 209. 



Polyhalite, 127. 



Polyhydrite, 245. 



Poly lite, 151. 



Polymignite, 209. 



Poonahlite, 167. 



Porcelain, manufacture of, 87 %, 



Porcelain clay, 372. 



Porcelain jasper, 137. 



Porphyry, 356. 



Porphyritic granite, 351. 



Potash, Nitrate of, 101. 



Potash, Salts of, 101. 



Potassium, Chlorid of 102. 



