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mylonite

American  
[mahy-luh-nahyt, mil-uh-] / ˈmaɪ ləˌnaɪt, ˈmɪl ə- /

noun

  1. Geology. a rock that has been crushed and sheared to such an extent that its original texture has been destroyed.

mylonite British  
/ ˈmɪlə-, ˈmaɪləˌnaɪt /

noun

  1. a fine-grained metamorphic rock, often showing banding and micaceous fracture, formed by the crushing, grinding, or rolling of the original structure

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
mylonite Scientific  
/ mī′lə-nīt′ /

  1. 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.

Etymology

Origin of mylonite

1885–90; mylon- (representing Greek mýlos mill) + -ite 1

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.