mylonite

[mahy-luh-nahyt, mil-uh-]
noun
Geology. a rock that has been crushed and sheared to such an extent that its original texture has been destroyed.

Origin:
1885–90; mylon- (representing Greek mýlos mill) + -ite1

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World English Dictionary
mylonite (ˈmaɪləˌnaɪt, ˈmɪlə-)
 
n
a fine-grained metamorphic rock, often showing banding and micaceous fracture, formed by the crushing, grinding, or rolling of the original structure
 
[C19: from Greek mulōn mill]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
mylonite   (mī'lə-nīt')  Pronunciation Key 
A fine-grained laminated metamorphic rock in which preexisting minerals have been partially pulverized and drawn out into bands. Mylonite forms along geologic faults where shearing and grinding of rocks takes place.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
West of the mylonite is a feldspar-rich amphibolite gneiss.
The intensity of strain within the regional foliation locally grades to mylonite.
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