See Also: hornfels(dictionary)
hornfels (iou)
hornfels noun & verb. M19.
[German = horn rock.]
Geology.
A. noun. A dark, fine-grained, non-schistose rock composed mainly of quartz, mica, and feldspars, and formed by contact metamorphism. M19.
b. verb trans. Metamorphose (a rock) into hornfels. E20.
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