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Fossils, 12, 14, 88, 96, 97-102, 142-143,
161, 221 FuUjor, 161 Friable minerals, 10 Fuller's earths, 27-28 Furnace, construction of, 27
Galena, 67, 179, 204, 209, 220
Galenus Pergamenus, 16, 29, 30, 32, 52,
66, 67, 70, 175, 179, 181, 193, 213 Garnet, 11, 113, 115, 135-137, 138
almandite, 136
grossularite, 136
pyrope, 135
rhodolite, 135-136 Gelerbolus, 34 Gems, 11, 15, 112-147
adularescent, 116-117, 122-123
asteriated, 123
banded, 112-113
black, 139
blue, 130-132
color of, 116-117
colorless, 118-122
doublets, 116
dyed, 130
engraving of, 114-115
flaws in, 117-118, 137
foil backs, 115
form, cut, 118
green, 124-130, 153
imitation and methods of detecting, 115
mythical, 144-145, 146, 147
occurrence, 113
physical properties, 112
play of color in, 6, 116-117, 122-123, 124
polishing, 114-115, 117-118
purple, 130-131
recovery of, 113
red, 132-137
relative values, 124, 130, 138, 147
white, 122-124
yellow, 137-139 Geodes, 14, 102-104, 164 Glaserze, 204 Glass, 110-111
volcanic, 111 Glessite, 71 Goethite, 12, 86-87 Gold, 8, 169-172
alloys, 184-186
occurrence, 169-170
plating, 188, 189
properties, 170
uses, 170-172 Goslarite, 215 Granite, 14, 152, 154 Gravel, 160
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Grossularite garnet, 136 Grunspan, 56 Gums, 63
Gunpowder, 45, 60 Gurgulius, 108 Gypsum, 89-93, 183, 187
Hadrianus Guilielmus, 128
Halite, see salt
Halotrichite, 215
Hardness of minerals, 11
Heliogabalus, 155, 171
Heliotrope, 127-128
Hematite, 13, 86-87, 162
Hemimorphite, 96, 187
Heraclitus Sicyonius, 2
Hermogenes, 208
Herodotus, 133, 153, 169, 171, 173
Hierocles, 94
Homer, 171, 184
Hornstone (hornstein), 110, 156-157
Horus, 2, 121
Hydrocarbons, 78-79, 112
Imitative forms of minerals, 14 lov, 131
Iris quartz, 6, 117, 120-121 Iron, 8, 182-183, 188
sulphates, 5, 7, 9, 13, 17, 18, 36, 47-51, 59 Isaacus, 64 Ismenias, 2
Jacchus, 2, 6, 116
Jasper, 6, 13, 112, 113, 125, 139-140,
147, 153 Jasponyx, 140 Jet, 7, 8, 61, 66-68, 70, 71 Juba, 2, 81, 119, 128, 129, 153, 208 Judiacum, 62 Justinian, 150
κά\αμος, 82
Kaolinite, 13, 14, 29-30, 31, 32, 34
«is, 108
Kisum, 213-214
κόβαλοί, 214
Krottenstein, 143
Lapis lazuli, 14, 109, 114, 115, 130, 147
Later, 164
Lead, 169, 178-179, 181, 209
acetate, 189-199
burnt, 180
foam of, 195-196
hearth, 195-196
minerals, 209-210
artificial oxide, 173, 180, 195-196, 198, 199
white oxide, 195
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