Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A fine-grained metamorphic rock composed of quartz, feldspar, mica, and other minerals, formed by the metamorphism of sedimentary rocks from heat associated with magma.
from The Century Dictionary.
- noun 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 Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Any of a series of contact
metamorphic rocks that have beenbaked andindurated by the heat ofintrusive igneous masses and rendered massive, hard,splintery , and in some cases exceedingly tough and durable.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a fine-grained metamorphic rock formed by the action of heat on clay rocks
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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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 King, Stephen 1997
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-- TB High Grade Zone - 500 metre of anomalous hornfels zone with drill results including:
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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.
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-- TB High Grade Zone - 500 metre of anomalous hornfels zone with drill results including:
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(VTEM) surveys flown in 2008 showed that outcropping granitic plugs are marked by magnetic lows while hornfels altered zones underlie magnetic highs.
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-- TB High Grade Zone - 500 metre of anomalous hornfels zone with drill results including:
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- Strong quartz stockwork with molybdenite in biotite hornfels has been observed adjacent to the Ethel zone (Drill Hole MX07-01).
unknown title 2009
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- Strong quartz stockwork with molybdenite in biotite hornfels has been observed adjacent to the Ethel zone (Drill Hole MX07-01).
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- 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).
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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 2009
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