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词汇 hornfels
释义

Definition of hornfels in English:

hornfels

noun ˈhɔːnfɛlzˈhɔrnfɛlz
mass noun
  • A dark, fine-grained metamorphic rock consisting largely of quartz, mica, and particular feldspars.

    角页岩

    Example sentencesExamples
    • 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.
    • The slate, where thermally metamorphosed, has been turned into siliceous hornfels and mica schist.
    • 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.
    • 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 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.

Origin

Mid 19th century: from German, literally 'horn rock'.

Definition of hornfels in US English:

hornfels

nounˈhôrnfelzˈhɔrnfɛlz
  • A dark, fine-grained metamorphic rock consisting largely of quartz, mica, and particular feldspars.

    角页岩

    Example sentencesExamples
    • The slate, where thermally metamorphosed, has been turned into siliceous hornfels and mica schist.
    • 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.
    • 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.
    • 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.

Origin

Mid 19th century: from German, literally ‘horn rock’.

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