[ sil-uh-muh-nahyt ]
/ ˈsɪl ə məˌnaɪt /
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a mineral, aluminum silicate, Al2SiO5, occurring in the form of long, slender, and often fibrous crystals.
THINK YOU’VE GOT A HANDLE ON THIS US STATE NICKNAME QUIZ?
Did you ever collect all those state quarters? Put them to good use on this quiz about curious state monikers and the facts around them.
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Mississippi’s nickname comes from the magnificent trees that grow there. What is it?
Also called fibrolite.
Words nearby sillimanite
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
Example sentences from the Web for sillimanite
In mica-gneisses sillimanite, kyanite, andalusite and garnet may occur.
Sillimanite usually forms exceedingly minute needles embedded in quartz.
British Dictionary definitions for sillimanite
/ (ˈsɪlɪməˌnaɪt) /
a white, brown, or green fibrous mineral that consists of aluminium silicate in orthorhombic crystalline form and occurs in metamorphic rocks. Formula: Al 2 SiO 5
Word Origin for sillimanite
C19: named after Benjamin Silliman (1779–1864), US chemist
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for sillimanite
[ sĭl′ə-mə-nīt′ ]
A usually white, pale-green or brown orthorhombic mineral occurring as long, slender, fibrous crystals in metamorphic rocks. It is a polymorph of andalusite and kyanite, but can form at higher temperatures than either of these. Chemical formula: Al2SiO5.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.