from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. hornfels
from the GNU version of the Collaborative International Dictionary of English
- n. A siliceous stone, a variety of quartz, closely resembling flint, but more brittle; -- called also chert.
from The Century Dictionary and Cyclopedia
- n. A very compact silicious rock, differing but little from flint.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a fine-grained metamorphic rock formed by the action of heat on clay rocks
horn + stone, translation of hornfels. (Wiktionary)