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A dark blue or greenish amphibole mineral, Na2Fe5Si8O22(OH)2, whose fibrous form is known as crocidolite asbestos.

[After Emil Riebeck (1853-1885), German explorer and mineralogist who in 1881 on an expedition to Socotra collected samples in which the mineral was later identified.]
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.


a mineral which is rich in sodium and is often translucent
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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