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Devils Tower National Monument
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By Mail
P.O. Box 10
Devils Tower, WY 82714-0010

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Hwy 110 Bldg 170
Devils Tower, 82714



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(307) 467-5283


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307-467-5350

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Close up of phonolite

Did You Know?
Devils Tower is made of phonolite porphyry. Phonolite refers to the ringing of the rock when a small slab is struck, and its ability to reflect sound. Porphyry refers to its texture, large crystals of feldspar embedded in a mass of smaller crystals.
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Last Updated: July 25, 2006 at 00:23 MST