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In page Crystal gazing:

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Books of instruction in the art of crystal gazing often suggest that the ball used should be perfectly spherical (that is, without a flat bottom) and should be supported in a wooden or metal stand. If made of glass (e.g. lead crystal), it should be free from air bubbles but may be colored. If carved from natural crystalline stone (such as quartz, beryl, calcite, obsidian, or amethyst), it may display the natural coloring and structure of the mineral from which it was fashioned. Some authors advise students to place a sigil, seal, or talismanic emblem beneath a clear sphere, but most do not. Most authors suggest that the work of crystal gazing should be undertaken in a dimly-lit and quiet room, so as to foster visions and more easily allow the onset of a trance state.[citation needed]