Quartz is a mineral, common on planets throughout the galaxy. A form of dilithium common on Earth was indistinguishable from a quartz crystal. When Humans researched the field of subspace physics, the fourth dimensional nature of dilithium became known, and much of Earth's natural quartz was sensor-scanned. Two to three percent was found to have actually been dilithium crystal. (TOS novel: Prime Directive)

One form of quartz crystal is tetrahedral quartz. The mantle layer of Sikaris III has an unusual tetrahedral quartz composition which makes the planet a natural conductor and amplifier of certain types of energy. One advantage of this power and transmission capability is the technology of the spatial trajector. (VOY episode: "Prime Factors")

In the year 2370, the Horta Ttan found a vein of quartz when she was looking for Latinum on the moon Davonia. (DS9 novel: Devil in the Sky)

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