staurolite

[stawr-uh-lahyt]
noun
a mineral, basic iron aluminum silicate, Fe 2 Al 2 O 7 (SiO 4 ) 4 (OH), occurring in brown to black prismatic crystals, which are often twinned in the form of a cross.

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

staurolitic [stawr-uh-lit-ik] , adjective
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World English Dictionary
staurolite (ˈstɔːrəˌlaɪt)
 
n
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]
 
staurolitic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
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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Example sentences
The source of the garnet is quartz-garnet-mica-staurolite schist that forms a portion of the walls of the canyon.
Rare minerals such as garnets, sillimanite, staurolite or andalusite can be common in places.
Rare minerals such as garnets, staurolite, or sillimanite can be abundant locally.
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