INDEX 



A JOUR mounting, 89 

 Abrasive agents, 70, 82 

 Absorption spectra, 343, 353, 



361 

 Achroite, 366, 369 

 Actinolite, 459, 489 

 Adamantine lustre, 37, 130 



spar, 294 



Adamas, 130 



Adelaide ruby (garnet) 279, 



355 

 Adolphskoi (Urals), diamond, 



230 

 Adularescence, 63 

 Adularescent felspars, 429 

 Adularia, 429 



moon-stone, 431 



Afghanistan, 277, 298, 441 

 Africa (German E.), 355 



(German S.W.), 340 



(South), 139, 179, 253, 



360, 421, 490, 495 

 see also Algeria, Egypt, 



etc. 

 Agate, 511 



amygdales, 483, 513 



artificial colouring, 522 



coral-, 497. 5 12 



cutting, 519 



glass, 518 



glass- (obsidian), 446 



Icelandic (obsidian), 448 



jasper, 501, 512 



kalmuck- (opal), 388 



Lohlbach (jasper), 500 



mother-of-pearl- (opal), 



388 



opal- (opal), 386 



Texas (jasper), 501 



Aggregates, 11 

 Agstein = jet, 556 

 Akabar = black coral, 615 

 Akbar Shah diamond, 249 

 Akori = blue coral, 615 

 Alabaster, 528 



onyx-, 527 



Alasmodon margaritifer, 594 

 Albite, 429, 431 



moon-stone, 431 



Alenfon diamonds (quartz), 477 



Alexandrian turquoise, 397 

 Alexandrite, 304 



cat's-eye, 305 



Algeria, 139, 317, 608 

 Allochromatic, 55 

 AUopora subviolacea, 615 

 Almandine, 352 



spinel, 297 



Aluminium pencil, 97, 565 

 Amause = strass, 98 

 Amazon-stone, 425 



(jadeite), 468 



Amber, 535 



bitumen, 535 



black (jet), 554, 556 



blue, 537, S39 



clarification of, 538 



lac, S36 



pressed, 552 



substitutes, 551 



varnish, 536, 546 



Ambre antique, 551 

 Ambroid, 552 

 Amethyst, 481 

 amygdales, 483 



burnt, 482, 486 



false (fluor-spar), 529 



occidental (quartz), 481 



oriental (corundum), 294 



sapphire, 294 



Amorphous substances, 8 10, 



27, 47 

 Amphibole group, 451 

 Amsterdam diamond, 249 

 Amygdales, 483, 513 

 Amygdaloidal agate, 513 

 Andalusite, 415 

 Anisotropic, 46 

 Anomalous double refraction, 



S3 

 Anthracite, 558 

 Anthrax, 265 

 Antipathes spiralis, 615 

 Antwerp rose, 78 

 Apatite, 531 

 Applications of precious stones, 



70 

 Apyrite = rubellite, 369 

 Aquamarine, 318 

 chrysolite (beryl), 324 



Aquamarine, oriental (corun- 

 dum), 293 



Siberian, 319 



Arabia, 507, 596 

 Arabian beads, 614 

 Aragonite, 528 

 Arbeitssteinfliessen (amber), 



549 

 Arciscuro coral, 603 

 Arizona ruby (garnet), 359 

 Arkansas diamonds (quartz), 



478, 479 

 Artificial colouring of stones, 

 59, 87 



agate, 522 



production of stones, 



93 



diamond, 236 



ruby, 280 



turquoise, 401 



Aschtrekker, 368 



Ash-drawer, 368 



Asia Minor, 339, 352, 463, 468, 

 608 



Asparagus-stone, 531 



Asteria, 284 



Asteriated ruby, 266, 284 



sapphire, 284 



topaz, 294 



Asterism, 64, 284 



Attached crystals, 68 



Augite = pyroxene, 451 



Australia, 139, 221, 278, 291, 

 293, 298, 317, 324, 340, 344, 

 355, 382, 387, 401, 416, 420, 

 465, 490, 509, 511, 526, S3I, 

 596 



Australian opal, 382 



Austria, 325, 468 — see also Bo- 

 hemia, Tyrol, etc. 



Austrian diamond, 250 



Avanturine, 502 



felspar, 427 



glass, 503 



quartz, 502 



Aventurine = avanturine, 502, 

 427 



Avicula margaritifera, 594 



squamulosa, 597 



Axe-stone, 458 



