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A usually white, hard mineral, Al2SiO5, occurring in highly metamorphosed rock as long, slender, fibrous crystals. Also called fibrolite.
[After Benjamin Silliman.]
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.
(Minerals) a white, brown, or green fibrous mineral that consists of aluminium silicate in orthorhombic crystalline form and occurs in metamorphic rocks. Formula: Al2SiO5
[C19: named after Benjamin Silliman (1779–1864), US chemist]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
sil•li•man•ite(ˈsɪl ə məˌnaɪt)
a needlelike or fibrous mineral, aluminum silicate, Al2SiO5, synthetic forms of which are used in ceramic insulators.
[1825–30; after B. Silliman (1779–1864), U.S. scientist]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.