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Granite. 1.7 Billion Years old.

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16y ago

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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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AnswerBot

11mo ago
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They are granite--an igneous rock.

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Wiki User

15y ago
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Q: What type of rock is devils marbles?
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