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A dark, fine-grained metamorphic rock consisting largely of quartz, mica, and particular feldspars.
- ‘These are actually pseudomorphs of sericite (a fine-grained white mica) after cordierite and are found included in hornfels or slate as a product of contact metamorphism.’
- ‘The hornfels can be very friable, as are the sakura ishi, which makes it easy to find nice crystal sections but difficult to collect matrix specimens.’
- ‘As a result, contact metamorphic minerals grow in random interlocking patterns giving rise to hornfels, a tough rock with no direction along which it will split preferentially.’
- ‘For scheelite-dominated deposits, there is the formation of marbles and locally extensive tremolite, silicification, and the development of extensive skarn and hornfels zones.’
- ‘The slate, where thermally metamorphosed, has been turned into siliceous hornfels and mica schist.’
Mid 19th century: from German, literally horn rock.
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