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Memory Alpha

Regolith was an ore found in asteroids.

The real world term "regolith" does not describe a mineral, but a loose mixture of material on planetary surfaces highly fractured by impacts.

In 2083, an asteroid containing regolith hit Terra Nova colony. Thermal shock caused by the impact of the asteroid on the planetary surface led to a toxic ore rain similar to nuclear fallout. (ENT: "Terra Nova")

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