staurolitic

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
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