Cachelong, 69, 70 Cairngorm, 107, 111 Calcite, 19 Cameo, 8 Cannel coal, see jet Cape garnet, 80, 83 Cape ruby, 80, 83 Carbon, 37 Carbonate, see carbon Carbuncle, 80 83 Carnelian, 17, 113, 123, 124 " onyx, 122 Cat’s-eye, corundum, 8, 54, 57, 115, 116 " quartz, 18, 58, 107, 113, 114, 115 Ceylon cat’s-eye, see corundum cat’s-eye " chrysolite, 64, 79 " opal, see moonstone " peridot, 64 Ceylonite, 47 Chalcedonyx, see chalcedony Chalcedony, 8, 9, 16, 17, 113, 118, 119, 120, 122, 124 Chrysoberyl, 16, 17, 45, 54, 56, 57, 79 Chrysolite, 17, 30, 53, 58, 78, 87, 99, 107 Chrysoprase, 17, 107, 113, 117 Cinnamon stone, see grossularite Cleavage, 10 Cloudy agate, 120 " chalcedony, see chalcedony Colors, 16 Coral, 130 Cordierite, see dichroite Corundum, 9, 17, 39, 45, 47, 48, 49 Crocidolite, 5, 18, 113, 115 Crystallization, 10 Cutting, 32 Cyanite, 17, 92 Cymophane, 54, 56, 57 Decimal system, 28 Demantoide, see Bobrowska garnet Diamond, 9, 11, 12, 14, 15, 17, 18, 20, 31, 32, 33, 35, 40, 41, 49, 51, 52, 60, 75, 101, 109 Dichroiscope, 14 Dichroite, 97 Diopside, 103 Egyptian jasper, 123 " pebbles, see Egyptian jasper Electricity, 31 Emerald, 8, 9, 16, 17, 18, 31, 44, 51, 87, 95, 107 Epidote, 17, 101 Essonite, see grossularite Euclase, 99 Eye agate, 119 False emerald, see fluor spar " lapis, 124 " ruby, see fluor spar " topaz, see fluor spar and yellow quartz Fancy sapphires, 44 Felspar, 20, 88, 91 Fish-eye, see moonstone Flint, 113 Fluor spar, 17, 19, 31, 104 Fortification agate, 119 Fossil turquois, 63 Fracture, 11 Fusibility, 28 Garnet, 12, 14, 15, 17, 21, 32, 42, 53, 64, 80, 107 Girasol, 46 Glass, 15 Golden beryl, 54 Goldstone, see avanturine Goutte d’eau, 85 Green felspar, see Amazon stone " garnet, 80, 99 " sapphire, see Oriental emerald Greenish-yellow sapphire, see Oriental chrysolite Grossularite, 30, 80, 82 Hair-stone, see cairngorm Heliotrope, 113, 116, 118, 120 Hematite, 18, 124 Hiddenite, 95 Hornstone, 113 Hungarian cat’s-eye, see quartz cat’s-eye Hyacinth, 42, 58, 59 Hydrophane, 69, 70 Hypersthene, 105 Iceland lava, see obsidian " spar, 14 Idocrase, 17, 98 Indian topaz, see yellow quartz Indicolite, 64, 67 Intaglio, 8 Iolite, see dichroite Iridescent quartz, see rose quartz Jacinth, 58, 59, 82 Jargoon, 58, 59 Jasper, 17, 106, 113, 123, 124 Jet, 16, 128