Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any of a series of contact metamorphic rocks that have been baked and indurated by the heat of intrusive igneous masses and rendered massive, hard, splintery, and in some cases exceedingly tough and durable.

from The Century Dictionary and Cyclopedia

  • n. In petrography, a dense, aphanitic rock composed of feldspar, quartz, and other minerals, usually a product of the contact-metamorphism of an intrusive rock upon shale or other sedimentary rock. Sometimes called hornstone.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a fine-grained metamorphic rock formed by the action of heat on clay rocks

Etymologies

German : Horn, horn; see hornblende + Fels, rock, cliff (from Middle High German vels, from Old High German felis).
(American Heritage® Dictionary of the English Language, Fourth Edition)
German, meaning "horn stone", after its frequent association with glacial "horn peaks" in the Alps. (Wiktionary)

Examples

  • They went single file, stopping once to clear a rockfall, pitching splintered chunks of shale and hornfels into the groan - ing trench to their right.

    Wizard and Glass

  • The preliminary, widely spaced five hole drill program encountered anomalous gold, arsenic and base-metals in intervals tens-of-metres thick with silicification, pyritic sulphides, within variable skarn and hornfels alteration.

    The Earth Times Online Newspaper

  • -- TB High Grade Zone - 500 metre of anomalous hornfels zone with drill results including:

    Latest News - Yahoo!7 News

  • (VTEM) surveys flown in 2008 showed that outcropping granitic plugs are marked by magnetic lows while hornfels altered zones underlie magnetic highs.

    The Earth Times Online Newspaper

  • The iron-rich skarn rocks, as well as other skarn types including epidote-silica skarns and sulphide-rich skarns, and hornfels rocks have been mapped as covering an area approximately 2,000 metres east-west by >

    ACN Newswire

  • - Strong quartz stockwork with molybdenite in biotite hornfels has been observed adjacent to the Ethel zone (Drill Hole MX07-01).

    The Earth Times Online Newspaper

  • - A fragment (or xenolith) of well mineralized intrusive within barren granodiorite was observed in drill hole MX07-03; - Disseminated molybdenite has recently been observed in intrusive rocks at the 805 mine level, currently below the Z zone described previously; and, - Strong quartz stockwork with molybdenite in biotite hornfels has been observed adjacent to the Ethel zone (Drill Hole MX07-01).

    FinanzNachrichten.de: Aktuelle Nachrichten

  • Three of the seven holes penetrate into a high temperature hornfels altered package of sediments below a near-horizontal fault.

    The Earth Times Online Newspaper

  • When plate tectonic activity formed the Rocky Mountains, the hornfels lifted up along with the shale that surrounded it.

    The Vail Trail - All Sections

  • Guano Prospect: The Guano occurrence consists of hornfels and diopside-calcite-phlogopite skarn located at the metamorphic aureole of a syenite intrusive of Mississippian age.

    Resource Investor - Main Content Feed

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