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HORNFELS #1 Hornfels - Other specific examples: #1 | #2 | #3 | #4 
Detail of this specimen
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Composition
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Description
Hornfels is a nondescript rock which varies widely in appearance. This specimen is typical, a dark gray to black,dense, hard, compact, massive rock breaking with conchoidal fracture into sharp angular pieces. It is harder than glass and has a dull luster.Be cautions; variations on this, especially color, are common - as well as confusion with similar looking rocks, such as basalt. |
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Tectonic Association
Hornfels results from the contact metamorphism of shales or other clay rich rocks in the viscinity of an igneous intrusion. As a result they have no specific tectonic association or meaning. They can form just about anywhere.
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Type of Metamorphism
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