HORNFELS

hornfels, hornstone

(noun) a fine-grained metamorphic rock formed by the action of heat on clay rocks

Source: WordNet® 3.1

Etymology

Noun

hornfels (countable and uncountable, plural hornfelses or hornfels)

Any of a series of contact metamorphic rocks that have been baked and indurated by the heat of intrusive igneous masses and rendered massive, hard, splintery, and in some cases exceedingly tough and durable.

Source: Wiktionary

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