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Sphene, 281 Spiller Arnber, 289 Spinel, 198
Almandine, 198 Ruby, 198 Sapphire, 198 Spodumene, 220 Staining precious stones, 76 Stalactitic Agate, 168 Star facets, 53
Quartz, 152
Sapphire,
195 Staurolite, 279 Step cut, 55 Strass, 68, 72 Succinite, 288
Succinum, 288 Sun Opal, 180 Sunstone (Oligoclase), 214 (Orthoclase),
212 Syrian Garnet, 249
T.
Table cut, 51, 55
Tables of the Law, 240
Tallow Drops, 56
Tassie, James, 68
Tauridan Topaz, 266
Thermo -metamorphic products,
18 Thetis Hair Stone, 158 Tiger's Eye, 226 Topaz, 262
Brazilian, 266
Burnt, 76
Fallow, 267
False, 131
Indian, 266
Occidental, 155
Oriental, 196
Saxon, 267
Spanish, 155
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Topazios (Topazius), 253, 262 Topazolite, 250 Total internal reflection, 25 Touchstone, 174 Tourmaline, 274
Achroite, 277 Aphrizite, 276 (Brazilian Emerald).
277 (Brazilian Sapphire),
276 (Ceylonese Chrysolite), 277 (Ceylonese Peridot),
277 deformation of, 20 Dravite, 277 Indicolite, 276 plates, 278 | Rubellite, 276
Schorl, 276 Siberite, 276 Travertine, 208 Triplets, 77 Turquois, 284
artificial, 91 origin.of, 11, 15
U. Ultramarine pigment, 243 Uralian Emerald, 250 Uvarovite, 250
V.
Varnishing inferior gems, 77 Vein Agate, 174 Venus' Hair Stone, 157 Vermeille, 246, 248
Oriental, 196 Verneuil, artificial Buby, 90 Vesuvian, 256
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