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Hyaline, see Quartz.
Hyalite, see Opal.
Hyalosiderite, see O 1 i-vine.
Hydrophane, see Opal.
Hypersthene.
Iceland agate, see Obsidian.
Ichthyophthalmite, see Apophyllite.
Idocrase, see Vesuvian-ite.
Ilmenite.
Indicolite, see Tourmaline.
Iolite.
Iris, see Quartz.
Isopyre.
Jacinth, see Zircon.
Jade.
Jargon, see Zircon.
Jargoon, see Zircon.
Jasper, see Quartz.
Jet, see Coal.
Job's tears, see Olivine.
Kunzite, see Spodumene.
Kyanite.
Labradorite.
Lapis-lazuli.
Lechosos opal, see Opal.
Leelite, see Orthoclase.
Leopardite, see Porphyry.
Lepidolite.
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Lintonite, see Thomson-ite.
Lithia emerald, see Spodumene.
Lithoxyle, see Opal.
Lodestone, see Magnetite.
Lydian stone, see Quartz.
Made, see Andalusite.
Magnetite.
Malachite.
Marble, see Carbonate of lime.
Marcasite, see Pyrite.
Marekanite, see O b s i d-ian.
Melanite, see Garnet.
Microlite.
Milky quartz, see Quartz.
Mocha stone, see Quartz.
Moldavite, see Obsidian.
Monazite.
Mont Blano ruby, see Quartz.
Moonstone, see O 1 i g o-clase.
Moonstone, see Orthoclase.
Morion, see Quartz.
Moss agate, see Quartz.
Moss opal, see Opal.
Mountain mahogany, see Obsidian.
Muller's glass, see Opal.
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