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Encyclopedic overview
Olivine basalt collected from the rim of Hadley Rille by the crew of Apollo 15
Moon rock or lunar rock is rock originating from Earth's Moon. This includes lunar material collected during the course of human exploration of the Moon, and rock that has been ejected naturally from the Moon's surface and landed on Earth as lunar meteorites.
Excerpted from Wikipedia’s “moon rock” article, available under the CC BY-SA 4.0 licence.