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The Genesis Rock The Genesis Rock is a sample of original lunar crust from around the time the Moon was formed. It was retrieved from the Moon by Apollo 15 astronauts James Irwin and David Scott. Chemical analysis of the Genesis Rock indicates that the rock is an anorthosite, composed mostly of the plagioclase feldspar, anorthite. The rock was formed in the early stages of the solar system, at least 4 billion years ago.[1] It was recovered in a crater of the Moon, near other rocks of its kind. Probing the rock with electron beams geologists pegged the rock´s age at 4.5 billion years. It therefore may represent a piece of the primordial crust. The solar system was formed only 100 million years earlier.[2] See also Apollo 15 Genesis Rock replica at the U.S. Astronaut Hall of Fame Moon rock Apollo 15 Anorthosite References ^ Apollo 15 samples overview Lunar and Planetary Institute ^ Chaikin, A., and T. Hanks. 1998. A man on the Moon : the voyages of the Apollo astronauts. Penguin Books, New York, N.Y. External links Lunar and Planetary Institute - Apollo 15 NASA - Apollo 15 Discovering the Genesis Rock (From the Apollo Lunar Surface Journal, scroll down to 145:41:48.) Astronaut Scott examines the Genesis rock. (image) An overview of the samples collected by Apollo 15. (The Genesis Rock is sample #15415 and is described but not listed by its number.) This article related to the Moon is a stub. You can help Wikipedia by expanding it. v • d • e