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PAGB
Mussels, pearl-bearing... 217
National Museum, U. S., collection, 33, 47, 58, 69, 74, 86, 90, 92, 104, 115, '5°. 169.172, 177, 185, 215, 230, 278, 284, 285, 287, 298,300,304,
305- 308. 323........328
Natrolite...........182, 271
Nephrite. .172, 173,266, 277
Nevada sapphire........ 50
New Jersey pearl find.... 227 New York State Museum collection, 72, 89, 109, 113,114, 116,165, 273, 326
Nigrine............... 193
North
American aboriginal lapidarian work— 303 North Carolina corundum 40
North Carolina diamonds .............. 17
North Carolina rock crystal.................. 108
North Carolina rubies.... 46 North Carolina zircon— 104 Novaculite............. 122
Obsidian.. 168, 268, 297, 307
Obsidian, analysis of..... 170
Obsidian arrow-heads.... 169
Obsidian coyote......... 304
Obsidian knives......... 298
Obsidian mirrors.:...... 299
Occurrence of diamonds in
the United States...... 14
Octahedrite............ 193
Oligoclase...........163, 167
Oligoclase, analysis of.. .. 168 Olivine (Chrysolite).. 101, 269
Onyx...............108, 130
Onyx, Californian....... 197
Onyx, Mexican......... 300
Onyx, sard, 108, 130,132, 264
Opal..........142, 266, 287
Opal agate............. 297
Opal, analysis of........ 143
Opal, fire......290, 293, 296
Opal, lechosos......287, 291
Opal, localities of. ... 142, 288
Opal, moss............. 144
Opal, semi..........144, 266
Opal, wood............ 135
Opalized wood.......... 145
Oregon diamonds....... 29
Oriental emerald.....39, 46
Oriental topaz.......39, 66
Origin of jadeite........ 283
Origin of turquoise rock.. 37 Ornamental uses of minerals................ 330
Ornamental uses of tri-
lobites................330
Orthoclase.....162, 164, 268
Orthoclase moonstone. .. 163 Ouvarovite. . .78, 86,258, 261 Ouvarovite, analysis of... 85
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PAGB
Parisite.............. 87
Parasites in pearl oysters. 215 Peabody Museum collection, 17, 73, 77, 90,
170, 194, 326........ 328
Pealite............146, 299
Pearl-bearing mussels___217
Pearl-find, New Jersey... 227 Pearl-fisheries, experiments in Saxony.....228
Pearl-fisheries in Lower
California............218
Pearl-oysters, divers for.. 220 Pearl-oysters, domiciliares
in..............214, 215
Pearl-oysters, parasites in 215 Pearl-production, artificial
devices for.......213, 228
Pearl, Queen, the discovery of................ 229
Pearls..............211, 312
Pearls, black........224, 225
Pearls, blister........... 214
Pearls, cave............ 197
Pearls, clam...........233
Pearls, colored.......... 230
Pearls, conch........... 235
Pearls, curious shaped... 216 Pearls, derivation of American................. 256
Pearls, extracting from
shells for De Soto...... 244
Pearls, formation of......211
Pearls, fresh-water...... 225
Pearls from Lower California, value of ... 223, 224 Pearls, history of American................. 240
Pearls in Marriott Mound,
Unio................ 227
Pearls, method of extracting in Saxony........ 232
Pearls, perforated....... 251
Pearls, shells containing.. 213 Pearls, size of fresh-water. 253
Pearls, Unio........216, 225
Pearls, value of conch.. 236 Pearls, value of fresh-water 201
Pectolite.......172, 178, 267
Pectolite, analyses of.... 179
Pegmatite..........165, 268
Perforated pearls....... 251
Peridot............101, 269
Peridot in meteorites..... 102
Peristerite..........166, 268
Perthite............166, 268
Phenacite.............. 98
Phenacite, analysis of.... 101 Phenomenal gems, definition of............... 311
Pipes, Indian...........208
Pipestone..............205
Pitchstone............. 170
Plasma................ 108
Polishing and grinding... 304 Polyadelphite, analysis of. 85 Porcelain jasper........ 108
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PAGB
Porphyry.............. 268
Prairie dog with eyes of
turquoise............ 61
Prase..........107, 120, 263
Precious stone, definition
of.................. 310
Precious stones, imports
of..............314, 3'S
Precious stones in the United States, production of, tables.....320, 321
Prehnite...........180, 270
Prochlorite in quartz.....287
Production of precious stones in the United States, table of... .320, 321
Properties of beryl...... 87
Properties of quartz...... 106
Properties of topaz...... 66
Properties of diamond___ 13
Properties of tourmaline.. 70
Pseudo-nephrite........ 174
Pseudomorph of turquoise 61
Pyrite.........198, 269, 299
Pyrite mirrors..........300
Pyrope garnet, 78, 80, 81, 276 Pyrope garnet, analysis of 84 Pyrope garnets, localities
of................80, 81
Pyroxene.......185, 261, 269
Quartz............... 106
Quartz, analysis of...... 128
Quartz, artificial gold.... 119
Quartz, asteriated....... 106
Quartz, aventurine...... 121
Quartz, cut objects of.... 113 Quartz crystals from Arkansas............... 110
Quartz crystals, localities
of...............112, 262
Quartz, ferruginous......305
Quartz, gold........117, 126
Quartz, inclusions....... 124
Quartz, localities of gold. 118 Quartz, milky.. 107, 125, 262
Quartz, properties of.___106
Quartz, rose... .107, 120, 262
Quartz, rose gold....... 118
Quartz, rutilated........ 125
Quartz, sapphirine...... 107
Quartz, smoky..107, 116, 262
Quartzite.............. 123
Quebec diamonds....... 262
Queen pearl, discovery of. 229 Quincke...............288
Rhodonite............ 151
Rhodonite, analysis of... 152 Rock crystal 107,26l,262, 284 Rock crystal, archaeological value of.......... 112
Rock crystal crescents... 286
Rock crystal from Alaska. 109 Rock crystal from North
Carolina............. 108
Rock crystal skull....... 285
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