Flexible sandstone

Also found in: Encyclopedia.
(Min.) the finer-grained variety of itacolumite, which on account of the scales of mica in the lamination is quite flexible.

See also: Sandstone

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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Over 21 metres high and built on a foundation of flexible sandstone, the intricately crafted structure of the twin towers was such that if you shook one, its twin shook in sympathy.
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