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A metamorphic rock without foliation.


Hornfels: The specimen shown is about two inches (five centimeters) across.

What is Hornfels?

Hornfels is a fine-grained nonfoliated metamorphic rock with no specific composition. It is produced by contact metamorphism. Hornfels is a rock that was "baked" while near a heat source such as a magma chamber, sill, or dike.

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