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hornfels

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hornfels

Metamorphic rock formed by rocks heated by contact with a hot igneous body. It is fine-grained, brittle, and lacks foliation (a planar structure).

Hornfels may contain minerals only formed under conditions of great heat, such as andalusite, Al2SiO5, and cordierite, (Mg,Fe)2Al4Si5O18. This rock, originating from sedimentary rock strata, is found in contact with large igneous intrusions where it represents the heat-altered equivalent of the surrounding clays. Its hardness makes it suitable for road building and railway ballast.



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? Mentioned in ? References in periodicals archive
 
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
Ground magnetic surveys (T/gradiometer) to delineate intrusive structures and hornfels surrounding.
Cloudbreak to Commence Exploration on Its 100% Owned Romanian Au-Ag & ... by Business Wire
The skarn mineralization is hosted in a dolomitic skarn situated between an underlying granitic intrusion and an overlying hornfels layer.
Dia Bras: Discovers Significant Copper-Iron Skarn at Bolivar South by Business Wire
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