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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: May 21, 2007 at 17:10 MST