hornfels [hawrn-felz] EXAMPLES|WORD ORIGIN noun a dark, fine-grained metamorphic rock, the result of recrystallization of siliceous or argillaceous sediments by contact metamorphism.
Origin of hornfels 1850–55; German, equivalent to Horn+ Fels rock, cliff Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019 Examples from the Web for hornfels Historical Examples of hornfels
From diabases, basalts, andesites and other igneous rocks a third type of hornfels is produced.
British Dictionary definitions for hornfels hornfels noun a hard compact fine-grained metamorphic rock formed by the action of heat from a magmatic intrusion on neighbouring sedimentary rocksAlso called: hornstone Word Origin for hornfels 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 hornfels in Science hornfels [hôrn′fĕlz′] A fine-grained metamorphic rock having a uniform grain size and formed by contact metamorphism. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.