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H.
Haematite, 65.
Hardness of minerals, 78 ; Moh's, scale of, ib.; rough scale, 79 ; of precious stones, 80; of gems, 136.
Hatchet-stone (jade), 361.
Hausmanite, 64.
Hauyne, described, 322.
Heliotrope, described, 282,
Hellefliata, or Leclite (felspar), 314.
Helvine, 28.
Hemihedric crystal, 21.
Hemiinorphism, 54.
Hemiorthotype system, 21.
Hexagonal system, 21, 39; pyramids 40; dihexagonal, 41 ; rbombohedral, 42.
Hexahedron, 22, 23; sign of, 27.
Hexakisoetahedrons, 25; sign of, 27.
Ilexaklstetrabedron, 23; sign, 30.
Holland diamond, 206.
Holohedric crystals, 21, 22.
Hope diamond. 206.
Hornblende, 63, 320.
Hornstone, described, 277.
Hyacinth, hardness of, 80 ; oriental, a sapphire, 215; a variety of zircon, 246; described, 247.
Hyacinth de Ceylon (Essonlte, or cinnamon-stone), 253.
Hyaline, 19.
Hydrate of magnesia, double refraction <.f, 83.
Hydrometer, 31.
Hydrophane, a variety of opal, 305 ; curions property, ib.
Hydroxide of iron, double refraction of, 89.
Hypersthene, not hornblende, 320; described, ib.
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Iron, double refraction of, SS; test of
127.
Iron pyrites, 30, 31, 55, 63. Irregular aggregation, 70. Isomorphic
substances, 111. Isomorphism, 110. Itacolumite, diamond-bearing rock,
188.
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Jade (nephrite, hatchet-stone, punamu) described, 361.
Jargon (see Zircon), 244 ; described, 246.
Jaspachates, a variety of agate, 234.
Jasper described, 273; varieties: 1, Egyptian ; 2, Ribbon spar, 276 ; jasper opal, 303.
Jet, hardness of, 80 ; described, 353 ; a bituminous coal, ib.
Jewish tribes, gems allotted to, 149.
Jeweller's wax, 172.
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K.
Kaolin, 75.
Kneeshaped crystal, 64.
Kohìnoor, a celebrated diamond, 154; ita
loss in cutting, 193; history of, 208. Kuinur, a celebrated diamond, 154. Kyanite (sappare, disthene) described, 327.
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L.
Labradorite, 70 ; not felspar, 317.
Lamellar, 71.
Lapidaries, ancient, 151; society of, 153;
gem lapidary, 163; common, 164; his
apparatus, ib. Lapis lazuli, or Armenian stone, described,
322
; uses of, 323. Lava described, 360. Lava, black glass lava, or
obsidian, 310. Lazulite, hardness of, 80 ; azure-stone, 324 ;
used to imitate lapis lazuli, ib. ì,ead,
66; test of, 125. Leclite (felspar), 314. Lepidolite, described, 399.
Leucite, 27. Lievrite, 48. Lithia, test of, 121. Lime, test of, 122.
Lithographic stone, 366. Love's arrows, a rock crystal, 261. Lustre, 93
; degrees of, 94 ; varieties ot, ib Lyncurium, not tourmaline, 258.
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I.
Iceland spar, 66 ; double refraction of, 86 : described,. 364.
Icositetrahedrons, 22, 24; sign of, 27.
Idocrase, double refraction of, 88 ; described, 321.
Ignoble metals, 101.
Imitations of gems, 172.
Indicolite (Brazilian sapphire), 256.
Iodine, test for, 119.
lolite, real gem, 136; described, 297; di-chroite, peliom, lynx and water sapphire, 298.
Iridescence, 93.
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