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Definition of Hornfels
1. Noun. A fine-grained metamorphic rock formed by the action of heat on clay rocks.
Definition of Hornfels
1. Noun. 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. ¹
¹ Source: wiktionary.com
Definition of Hornfels
1. a silicate rock [n HORNFELS]