hornfels Syllabification: (horn·fels)Pronunciation: /ˈhôrnˌfelz/Definition of hornfels noun a dark, fine-grained metamorphic rock consisting largely of quartz, mica, and particular feldspars. Origin: mid 19th century: from German, literally 'horn rock'hornfels in other Oxford dictionaries Definition of hornfels in the British & World English dictionary
