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Related to staurolite: sillimanite
A brownish to black mineral, chiefly (FeMg)2Al9Si4O23(OH), often having crossed intergrown crystals and sometimes used as a gem.
stau′ro·lit′ic (-lĭt′ĭk) adj.
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 brown glassy mineral consisting of iron aluminium silicate in the form of prismatic crystals: used as a gemstone. Formula: Fe2Al9Si4O11(OH)2
[C19: from Greek stauros a cross + -lite]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a mineral, an iron-magnesium-aluminum silicate, occurring in brown to black prismatic and flattened crystals, which are often twinned in the form of a cross.
[1790–1800; < Greek stauró(s) a cross + -lite]
stau`ro•lit′ic (-ˈlɪt ɪk) adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.