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compact,ib.; the original bed of. 187: loss In cutting, 193; Hindoo division of, 19.5; value, ib.; color, purity, ib. ; degree of clearness, ib. ; cut
and size, 196; prices of, 197-8; celebrated diamonds, 154.193, 203; the
largest known, 208; in Victoria's crown, 211 ; at the Industrial
Exhibition, 212.
Diamond grinders, 155.
Dimorphism, 110.
Dmptase, double refraction of, 88.
Disthene (Kyanite, sappare), described, 327.
Ditetragonal, pyramids, 36.
Divelsteene, 156.
Dodecahedrons, subdivided, 22.
Dolomite, double refraction of, 87.
Double facet cut, 165.
Doublets, ISO.
Druses, 71.
Drusy crystals, 56.
Dyakisdodecahedron, 30; sign, 31.
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Fluor
spar, crystalline forms, 23 21, 25, 56, 63, 65,70; hardness, 78, 80;
double refraction of, S8; electricity, 99; described, 333.
Fluorine, test for, 120.
Foil, use of, 169-
Form, primary, 26; semt-tesseral, 28; parallel semi-tesseral, 30.
Forms of crystalline aggregates, 71.
Fortification agate, 284.
Fracture surfaces, 78.
Fusibility, test minerals as to, 115.
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Galena, 23, 24, 56, 63
Garlic, used in repairing gems, 170.
Garnet,
23, 25, 27; hardness of, 80; double refraction of, 88; magnetic, 100; a
real gem, 136 ; described, 247 ; varieties, 248 ; Syrian, Bohemian,
Ceylonian, Aplome, ib.; precious or almandine, 24S ; coloph-onite, 249 ; allochroite, ib.; grossular, 250; topazolite, ib.; melanite, pyrena-ite, ouwarowite, ib.; the ancient carbuncle, 251.
Gems, 135 ; enumerated, 136; color, gravity, and hardness of, ib.; chemical character, 139 ; composition, ib.; artificial
production, 140 ; geological character, 145; geographical distribution,
146; division and nomenclature, 147; history of, 148 ; superstitions
as to, 149 ; sculpture in, 151; grinding, 153; engraving, 167; sawing
and drilling, 168; polishing materials, ib.; heightening color of, 169 ; setting, 171; cleaning of, 172; imitations, ib,; 1, pastes, ib.; 2, doublets, 180 ; 3, burning, 180; price of, 181; optical use of, 181.
Girasol sapphire, 216; fire opal, 304; adularla, 313.
Girdle, in diamonds, what? 161.
Glucina, test of, 123.
Goldstone, a paste, 273.
Goniometers, 58.
Goutte de sang, a spinelle, 228.
Grand mogul diamond, 193, 203.
Granite, described, 396; American varieties, 397.
Gray copper ore, 28, 63.
Grossular garnet, 250.
Gypsum crystals, 51, 56, 68, 74; double refraction of, 88 ; satin gypsum, 341 ; alabaster, ib.
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E.
Edingtonate, double refraction of, SS.
Electricity of minerals, 99.
Electro-chemical elements, table of, 105.
Electroscopes, 99.
Elongated brilliant facet cut* 165.
Emerald,
hardness of, 80; double refraction. 83; a real gem, 136; the oriental,
a sapphire, 216; described, 235; emer;tld proper, ib.; how cut, 237; velue, ib.; remarkable emeralds, 238 ; the Duke of Devonshire's, 239 ; the Brazilian, a tourmaline, 256.
Emery, a common corundum, 224.
Engraving on gems, 167.
Essonite, or cinnamon-stone; hardness of, SO; real gem, 136, 250; described, 253.
Euclase, double refraction of, S7; description of, 234.
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F.
Faoete, 101.
Fablore, 63.
Felspar, 52, 53, 75; described, 812; common, 815; adularia, 312; murcbtsonite, 314; leclite or hellefliata, couazeranite, ib.; amazon-stone, 315; porphyry, 391; aienete, 893.
Fish-eye (adularla), 313.
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