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H.
Half-brilliant, 55 Hardness, 42
table of, 44 Harlequin Opal, 178 Haiiyne, 240 Hawk's Eye, 226 Heat, conductivity of, 33
effects of, 33 Heliolite, 215 Heliotrope, 165
of Pliny, 164 Hessonite, 245 Hiddenite, 220 Hope Blue Diamond, 95 Hornblende, 224 Hornstone, 174 Hyacinth, 261
of Compostella, 160
Oriental, 196 Hyacinthus, 183 Hyalite, 182 Hydrophane, 181 Hydrostatic balance, 39
I.
Iaspis, 161, 164
Idioinorphic crystals, 49
Idiomorphism, 19
Idocrase, 256
Indian Topaz, 266
Indicolite, 276
Indigolite, 276
Inscription, supposed effect of, 3
Intercepts, crystal, 47
Intrusive rock, origin of, 17
Iolite, 238
Iridescence, 31
Iris Quartz, 152
Itacolumite, 114
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J.
Jade (Jadeite), 222 (Nephrite), 224
Jadeite, 224 Jargon, 261 Jasp-opal, 182 Jasper, 174
Agate, 169
Egyptian, 175
origin of, 15
Wood, 175 Jet, 289
K.
Kidney Stone, 224 Kimberley Diamond mines, 10 Koh-i-Noor, cutting the, 61 Kunzite, 220 Kyanite, 269
L.
Labradorescence, 31 Labradorite, 215 Lap for Diamonds, 60
for softer gems, 63 Lapis Lazuli, 240
Lyncurius, 4
Tiburtinus, 208 Lazurite, 240 Lechosos Opal, 180 Leucaehates, 161 Leuco-sapphire, 184 Ligure, 259
Loss of weight in cutting, 66 Louis de Berquem, 50 Lumacello, 207 Lustre of minerals, 22 Lychnis, 183, 198 Lydian Stone, 174
origin of, 17
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