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staurolitic

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stau⋅ro⋅lite

[stawr-uh-lahyt]
–noun
a mineral, basic iron aluminum silicate, Fe2Al2O7(SiO4)4(OH), occurring in brown to black prismatic crystals, which are often twinned in the form of a cross.

Origin:
1790–1800; < Gk stauró(s) a cross + -lite


stau⋅ro⋅lit⋅ic [stawr-uh-lit-ik] , adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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stau·ro·lite   (stôr'ə-līt')   
n.  A brownish to black mineral, chiefly (FeMg)2Al9Si4O23(OH), often having crossed intergrown crystals and sometimes used as a gem.

[Greek stauros, cross; see stā- in Indo-European roots + -lite.]
stau'ro·lit'ic (-lĭt'ĭk) adj.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Science Dictionary
staurolite   (stou'rə-līt')  Pronunciation Key 
A brownish to black orthorhombic mineral, often having crossed intergrown crystals and found in mica schists and gneisses. Chemical formula: (FeMg)2Al9Si4O23(OH).
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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