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Hornfels

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hornfels [′hȯr‚felz]
(petrology)
A common name for a class of metamorphic rocks produced by contact metamorphism and characterized by equidimensional grains without preferred orientation.
Hornfels 

a dense, fine-grained rock produced by the action of an instrusive body on the enclosing rocks. Hornfels differs in composition from the rocks that have been metamorphosed. Clay rocks become hornfels containing cordierite, andalusite, sillimanite, garnet, biotite, and feldspars. Basalts, basalt tuffs, and graywackes become hornfels with pyroxenes, basic plagioclase, and hornblende. Marls become hornfels with wollastonite, olivine, spinel, and carbonates. As the quantity of carbonates increases, hornfels become contact marbles.
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A recent deep drill hole confirmed the work and intersected a very wide zone of hornfels with intense quartz-sulfide-sericite stockwork veining and flooding.
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A large hornfels and skarn zone surrounds the intrusive.
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The sedimentary rocks have been metamorphosed to biotite hornfels around the contact of the intrusive.
Piedmont Announces First Drill Program Completed At Dutch Flat, Nevada by Business Wire
 
 
 
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