| | |  | | Phantom quartz usually occurs in rock crystal, but is also found in smoky quartz, citrine, and amethyst. Rock crystal is transparent and colorless quartz. It commonly occurs inside quartz veins where it crystallizes in rock cavities known as vugs or pockets Phantom quartz crystal shapes can sometimes be seen in the interior of quartz crystals, outlining an earlier stage of the crystal's formation.  |  |
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