The most common hornfels ( the biotite hornfels ) are dark-brown to black with a somewhat velvety weathered faces of the rock.
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At Tievebulliagh, Northern Ireland, porcellanite is a tough contact metamorphosed hornfels formed from a lateritic soil horizon within a basaltic intrusive / extrusive sequence.
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However, the diabase and related hornfels which form the backbone of the mountain are a type of highly erosion resistant stone known as trap rock.
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This contact reveals the presence of indurated red sandstone that has been baked into a grey hornfels by the heat of the First Watchung lava flow.
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In biotite hornfels, a faint striping may indicate the original bedding of the unaltered rock and corresponds to small changes in the nature of the sediment deposited.
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Tourmaline hornfels are found sometimes near the margins of tourmaline granites; they are black with small needles of schorl that under the microscope are dark brown and richly pleochroic.
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In addition to diabase, Haycock Mountain features a large area underlain by hornfels, or local sedimentary rock that has been baked by the heat of the magma intrusion.
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The stone found at the quarry is not basaltic in origin, but a heavily-metamorphized sedimentary slate known as hornfels, that has a significant amount of silica.
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Adjacent to the sills, the Hatakai Shale has been altered to knotted hornfels containing porphyroblasts of andalusite and cordierite that have been replaced by muscovite and green chlorite, respectively.
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This is usually related to the metamorphic temperatures of pelitic or aluminosilicate rocks and the minerals they form . The metamorphic grades of aureoles are andalusite hornfels, sillimanite hornfels, pyroxene hornfels.
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