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A fine-grained metamorphic rock formed by the action of heat on clay rocks
Answer for the clue "A fine-grained metamorphic rock formed by the action of heat on clay rocks ", 9 letters:
hornstone
Word definitions for hornstone in dictionaries
Wiktionary
Word definitions in Wiktionary
n. hornfels
The Collaborative International Dictionary
Word definitions in The Collaborative International Dictionary
Hornstone \Horn"stone`\, n. (Min.) A siliceous stone, a variety of quartz, closely resembling flint, but more brittle; -- called also chert .
WordNet
Word definitions in WordNet
n. a fine-grained metamorphic rock formed by the action of heat on clay rocks [syn: hornfels ]
Usage examples of hornstone.
Kirkilgowock's silvery hornstone roofs shimmered two miles away across the Bay of Repose.