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A variety of sandstone that is flexible when cut into thin slabs.

[After Itacolumi (Itacolomi), a mountain of east-central Brazil.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Geological Science) a fine-grained micaceous sandstone that occurs in thin flexible slabs
[C19: named after Itacolumi mountain in Brazil where it is found]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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It consisted of a long strip of itacolumite hooked to an electric motor which, when activated by pushing a switch on the outside of the case, caused the rock to flex up and down: itacolumite is known as "the rock that bends."