(m 



INDEX 



Sinai, ; 396 



SincorA stones, 173 



Single cabochon, 79 



refraction, 46, 60 



Sioux Falls jasper, 501 

 Sliaifs, 244 



• Slave's diamonds (topaz), 330 

 Slitting or cutting disc, 84 

 Small melc (diamond), 213 

 Smoky-quartz, 479 



burnt, 480, 486 



stones (diamond), 133, 



13s, 2n 



— topaz (quartz), 479 



Sodalite, 440, 446 



Solitaires, 242 



Somondoco (Colombia), emer- 

 ald, 313 



Soul of the diamond, 219 



South Africa — see Africa 



Southern Star diamond, 177 



Spain, 139, 196, 345. 433, 48S, 

 503, 533, 557, 610 



Spanish emerald, 312 



topaz (quartz), 487 



Spar-ornaments, 530 



Specific gravity, 1 1 



^—7— bottle, 12 



determination of, 



12, 562 



indicators, 22 

 gravities, table of, 26 



Spectrum, 43 



absorption, 343,, 353, 



361 

 Speculative stones (diamond), 



214 

 Spessartite, 352 

 Sphene, 421 



Spiller imitations of amber, 552 

 Spinel, 295 



almandine-, 297 



-ruby, 297 



sapphire-, 299 



• twin-law, 124, 296 



vinegar-, 297 



Splints (diamond), 209 

 Spodumene, 455 

 Spotted agate, 506 



chalcedony, 506 



Spread cut, 71 

 Sprudelstein, 528 

 Stalactitic marble, 527 

 Star facets, 73 



of a rose, 78 



of Este diamond, 251 



of South Africa diamond, 



180, 253 

 of the South diamond,i77. 



252 



-agate, 51; 



Star-cut, 75 



ruby, 266, 284 



sapphire, 284 



stone, 284, 



-^opaz, 284 



Starling-stone, 496 



Staurolite, 415 



Step-cut, 76 



Stewart diamond, 253 



Stone tract, 270 



Strahler, 476 



Strand-amber, 541 



Strass, 98. 



Streak, 59 



Striped chalcedony, 504 



Strombus gigas, 591, 600 



Styria, 452, 460, 503 



Substitution of common for 



:rare stones, 95 

 Succinite, 535 



Sumelpur (India), diamond, 151 

 Sun-opal, 384 



spangles in amber, 539 



stone, 426 



(moon-stone), 43 1 



.Suture-stones, 124 

 Sweden, 299, 456^ 599 

 Switzerland, 327, 351, 369, 414, 



.415, 421, 430, 460, 476, 480, 



529 

 Symmetry of crystals, 9 

 Syrian garnet, 354 



Table of a cut stone, y^ 



cut, 77 



stone, 77 



Taj-e-mah diamond, 250 

 Tallow-topped, 79 

 Tangiwai, 465 

 Tapanhoacanga, 162 

 Tauridan topaz, 330 

 Tavernier's rule, 105, 259, 593. 

 Technical applications, 70 

 Teeth of a rose, 78 

 Tejuco (Brazil), diamond, 155, 



158 

 Tetartohedral crystals, 10 

 Tetragonal system, 10, 47, 51 

 Texas agate, 501 

 Thallium glass, 98 



lead glass, 99 



silver nitrate, 23 



Thermal characters, 65 

 Thetis' hair, 489 

 Thick cut, 71 



stones, 77 



Thin-cut, 71 



stones, 77 



Thomsonite, 422 

 Tiffany Brilliant, 254 



Tiger-eye, 493 



Tiles (amber), 549 



Titanite, 421 



Tooth-turquoise, 402 



Topaz, 327 



as grinding material. 



84 



Bohemian (quartz), 487 

 Brazilian, 331 

 burnt, 332 



— : cat's-eye, 284, 294 



false (fluor-spar), 529 



■ (quartz), 487 



golden (quartz), 487 



Indian, 331, 339 



(quartz), 487 



■ occidental (quartz), 487 



oriental (corundum), 293 



rose-, 332 



Saxon, 331 : 



Siberian, 330 



smoky (quartz), 479 



Spanish (quartz), 487 , 



star-, 284, 294 ; 



sapphire (corundum), 293 



Topazolite, 362 

 Tornature, 86 

 Total reflection, 40 



angle of, 40 



Tourmaline, 363 



Translucency, 34 



Translucent stones, 576 



Transparency, 34 



Transparent stones, 566 



Trap-cut, 76 



Tree-stone, 506 



Triclinia system, 10, 47, 51 



Triple-cut brilliant, 74 



Triplet, 10 



Tunis, coral, 608 



Turamali, 372 



Turkish gem, 392 



Turquoise, 389 



Alexandrian, 397 



artificial, 401 



bone-, 402 



— — de la nouvelle roche, 402 



de la vipille roche, 389 



■ Egyptian, 397 



■ fossU,, 402 



Mexican, 397 



occidental, 403 



oriental, 389 



■ Persian, 393 



• tooth-, 402 - . ; . 



Twinlones, 272 



Twinned crystals, 10, 123 



Twins (diamond), 209 



Tj'rol, 299, 341, 355, 413, 414, 



421, 430, 452, 454, 485, 530, 



S3I 



