INDEX 



■6S3 



Marekanite, 448 



Marmorosch diamonds (quartz), 



477 

 Masculine carnelian, 508 



colours, 56 



— • — ruby, 265 

 Masha, 104 

 Massive, 9 



amber, 536 



Mattan, supposed diamond, 247 

 Matto Grosso (Brazil), diamond, 



171 

 Matura diamonds (zircon), 342, 



343 



Mazarins, 73 



Melanite, 362 



Mele (diamond), 213 



Meleagrina margaritifera, 594 



Menilite, 387 



Metallic lustre, 36, 581 



sheen, 64, 582 



Meteorites, diamond in, 232 



Methylene iodide, 20, 39, 53, 562 



Mexican amber, 556 



opal, 377, 381 



Mexico, 139,337,359,362,381, 

 384, 386, 387, 398, 448, 468, 

 484, 527, 556, 597 



Mica, lithia-, 457 



Milk-opal, 386 



Minas novas (topaz), 334 



Mineral turquoise, 389 



Mineralogy, 3 



Minerals suitable for gems, i 



Miscal, 105 



Mixed-cut, 76 



Mocha-stone, 506 



Mogok (Burma), ruby, 270 



Mohs' scale of hardness, 30 



Moldavite, 449 



Monobromonaphthalene, 5 3 



Monoclinic system, 10,47, 51 



Montana, sapphire, 290 



Moon of the Mountains dia- 

 mond, 249 



Moon-stone, 429 



Moor, mounting on, 90 



Morallion, 315 



Moravia, 449, 457 



Morion, 479 



Moroxite, 531 



Moss-agate, 507 



opal, 386 



stone, 489 



Mossy-emeralds, 309 



Mother-of-emerald, 488 



opal, 379 



pearl, 585 



agate, 388 



opal, 388 



-ruby, 271 



Mountain-mahogany, 446, 448 

 Mounting and setting stones, 89 



on moor, go 



Muang Klung (Siam), ruby, 275 

 Miiller's glass, 385 

 Muleli (India), diamond, 149 

 Munimadagu (India), diamond, 



145 

 Murrhine vases, 517, 530 

 Muzo (Galombia), emerald, 313 



Naadsteenen, 124 



Nacre, 585 



Nandial (India), diamond, 147 



Nassak diamond, 251 



Natrolite, 422 



Needle-stone, 489 



Negro-heads, 56, 366 



Nepheline, 436 



Nephrite, 457, 458. 



Nephritoids, 457 



New Mexican turquoise, 397 



New Zealand greenstone, 464 



Newkerke (Vaal R.\ diamond, 



185 

 Newland's diamond mine (S. 



Africa), 197 

 Nicol's prism, 50 

 Nile jasper, 500 

 Nizam diamond, 250 

 Noble beryl, 308 



corundum, 263 



opal, 373, 374 



spinel, 295 



Nomenclature, 106 



Nonpareils, 242 



Norway, 316, 343, 410, 427, 



431, 437, 599 

 Noumeaite, 420 

 Novo-Urei meteorite, diamond 



in, 232 



Oberstein, cutting works at, 



518 

 Obsidian, 446 

 Occidental agate, 512 



amethyst, 481 



cat's-eye (quartz), 491 



— — chalcedony, 506 



diamond (quartz), 479 



pearls, 597 



stones, 70, 292 



topaz (quartz), 487 



turquoise, 402 



Occurrence, modes of, 68 

 Oculus, 379 



mundi, 387 



Odontolite, 402 

 Oiil-de-boeuf, 434 



Off-coloured stones (diamond), 



213 

 Oitava, 104 

 Old de Beer's diamond mine, 



182 

 Old de Beer's New Rush, 182 

 Oligoclase, 428, 429 



sun-stone, 428 



Olives, 518, 547, 614 

 Olivine, 404 



-rock, diamond in, 196 



Onyx, 512, 521 



-alabaster, 527 



black, 558 



-marble, 527 



opal, 375 



Opal, 373 



agate, 386 



Ceylonese (moon-stone), 



429 



common varieties, t,-/2i, 



385 



fire-, 384 



Hungarian, 377 



jasper, 385 



Mexican, 377, 381 



mother-of-, 379 



onyx, 375 



oriental, ^yj 



precious, 373, 374 



semi-, 385 



water- (moon-stone), 429 



Opalescence, 64 



Opalescent chrysoberyl, 302 



ruby, 284 



sapphire, 284 



Opaline, 382 



Opaque stones, 34, 576 



Open setting, 89 



Optic axes, 51, 61 



Optical characters, 34, 562 



Optically rarer or denser, 38 



Orange River (S. Africa), dia- 

 mond, 180, 185 



Colony, diamond, 



182 



Orient of a pearl, 589 



Oriental agate, 512 



amethyst (corundum), 294 



aquamarine (corundum). 



293 



302 



293 



cat's-eye (chrysoberyl), 

 2 



chalcedony, 506 

 chrysolite (corundum), 



(chrysoberyl), 302 



emerald (corundum), 293 

 girasol (corundum), 284 

 hyacinth (corundum), 294 

 jasper (heliotrope), 511 



