- 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 horn + Fels rock, cliff
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for hornfels
From diabases, basalts, andesites and other igneous rocks a third type of hornfels is produced.
- a hard compact fine-grained metamorphic rock formed by the action of heat from a magmatic intrusion on neighbouring sedimentary rocksAlso called: hornstone
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
- A fine-grained metamorphic rock having a uniform grain size and formed by contact metamorphism.
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