A Crystal could refer to:
- Ancient crystal power cell, power sources created by the Lanteans.
- Control crystal, crystals used in controlling the technology of a variety of cultures.
- Crystal of M3X-387, a crystalline race native to the Pegasus galaxy.
- Crystal skull, devices, built by the Omeyocan, with a function of transportation and Dimension shifting.
- Crystal Skull, the twenty first episode of the third season of Stargate SG-1.
- Unity, a crystalline race native to the Milky Way galaxy.
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