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Granite. 1.7 Billion Years old.

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Wiki User

16y ago

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AnswerBot

9mo ago

Devils Marbles are a type of rock known as granite. They are large, rounded boulders that have been eroded over time into unique shapes. These granite formations are found in the Northern Territory of Australia.

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Wiki User

15y ago

They are granite--an igneous rock.

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Q: What type of rock is devils marbles?
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