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Cat's Eye. 201
Ceylon,
208 Occidental, 158 Oriental. 203 Quartz. 158 Ceylonese Cat's Eye, 208
Chrysolite, 277 Opal, 211 Peridot, 277 Ruby, 249 Ceylonite, 199
Chalcedony, 161
origin
of, 11 Change of colour. 31 Charles the Hold's Diamond, 50 Chatoyency.
31 Chiastolite. 268 Chloromelanite, 228 Chlorospinel, 198 Chrysoberyl,
201 ,
of the ancients :— See Clirysoprase, 163 See Chrysolite, 253 Chrysoberylius. 229 Chrysocolla of Theophrastus. 208 Chrysolite. 213
Aquamarine, 229 Cape, 274 Ceylonese, 277 Oriental, 196 Saxon, 267 Chrysolithus. See Topaz.
262 Clirysoprase, 163 Chrysoprasius, 168, 229 Cinnamonstone. 245
Citrine. 155 Cleavage. 44 Cloud Agate. 169 Colorado Ruby, 248 Colour of
minerals. 21 Common Garnet, 248, 249 Copper Emerald. 255
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Corallachates, 159 Cordierite, 238
Asteriated, 240 Corundum, 183
Common, 185, 196 Crocidolite, 226
Crookes on production of Diamonds, 85 Crown (of cut gems), 53 Crystal cups, 146 Crystal models, construction of,
48
Crystalline form, 46 Crystallisation, Boyle's description of, 15
Crystallographic faces, 46 forms, 46 systems, 47 Crystal lus, 146
Crystals, modes of formation of, 7 Culasse (of cut gems), 53 Cutting en cabochon, 56 pressure for, 61 speed of, 60 Cyanite, 269 Cymophane, 201
D.
Demantoid, 249
Dense solutions, 36
Detection of imitation gems, 70,
74 Diamond, 93
a reputed poison, 6 anomalous double refraction, 96 applications of, 131 artificial, extraction of, 84 production, 81
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