hornfels

(hôrnfelz′)

noun pl. hornfels

a fine-grained metamorphic rock usually formed at shallow depths

See hornfels in American Heritage Dictionary 4

noun pl. hornfels hornfels
A fine-grained metamorphic rock composed of quartz, feldspar, mica, and other minerals, formed by the action of intrusive rock upon sedimentary rock, especially shale.

Origin:

Origin: German

Origin: : Horn, horn; see hornblende

Origin: + Fels, rock, cliff (from Middle High German vels, from Old High German felis)

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