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hornfels

[hawrn-felz] /ˈhɔrn fɛlz/
noun
1.
a dark, fine-grained metamorphic rock, the result of recrystallization of siliceous or argillaceous sediments by contact metamorphism.
Origin of hornfels
1850-1855
1850-55; < German, equivalent to Horn horn + Fels rock, cliff
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Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for hornfels

hornfels

/ˈhɔːnfɛlz/
noun
1.
a hard compact fine-grained metamorphic rock formed by the action of heat from a magmatic intrusion on neighbouring sedimentary rocks Also called hornstone
Word Origin
German: literally, horn rock
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
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hornfels in Science
hornfels
  (hôrn'fělz')   
A fine-grained metamorphic rock having a uniform grain size and formed by contact metamorphism.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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