a dark, fine-grained metamorphic rock, the result of recrystallization of siliceous or argillaceous sediments by contact metamorphism.

1850–55; < German, equivalent to Horn horn + Fels rock, cliff

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World English Dictionary
hornfels (ˈhɔːnfɛlz)
Also called: hornstone a hard compact fine-grained metamorphic rock formed by the action of heat from a magmatic intrusion on neighbouring sedimentary rocks
[German: literally, horn rock]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
hornfels   (hôrn'fělz')  Pronunciation Key 
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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Example sentences
Even if this process could occur, entry of such pollen and spores into the
  nonporous hornfels lacks an explanation.
Red mudstone is typically altered to indurated, bluish-gray hornfels with clots
  or crystals of tourmaline or cordierite.
Geologists call such rocks hornfels that is, horn rock.
Contact metamorphism around intrusions produced epidote hornfels and locally,
  amphibole hornfels.
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