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n. pl. hornfels
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.

[German : Horn, horn; see hornblende + Fels, rock, cliff (from Middle High German vels, from Old High German felis).]


(Geological Science) a hard compact fine-grained metamorphic rock formed by the action of heat from a magmatic intrusion on neighbouring sedimentary rocks. Also called: hornstone
[German: literally, horn rock]


(ˈhɔrn fɛlz)

a dark fine-grained metamorphic rock, the result of recrystallization of siliceous or argillaceous sediments by thermal metamorphism.
[1850–55; < German, =Horn horn + Fels rock, cliff]


A type of granular, fine-grained metamorphic rock.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.hornfels - a fine-grained metamorphic rock formed by the action of heat on clay rocks
metamorphic rock - rock altered by pressure and heat
References in periodicals archive ?
Moreover, the emplacement of the Logrosan granite has produced a superimposed contact metamorphism characterized by an inner biotite-tourmaline hornfel zone, an intermediate zone of micaceous spotted slates, and a transition zone of recrystallized slates and some metaquartzite levels (Fig.
The oxidized sulfide mineralization is associated with quartz veining, vein stockwork, and quartz healed breccia hosted in hornfels altered clastic sediments.
The drill program is expected to confirm the continuity and shape of the high grade gold mineralization below the proposed pit that is hosted in the complex breccia and it will also explore the gold mineralization indications at depth hosted in hornfels skarn, typical of the Guerrero Gold Belt.
A detailed study of morphology and chemistry of garnet crystal with suggestion of new subdivisions: data from pelitic schists, hornfels and aplites of Hamedan Region, Iran.
In the study area lithological units is outcrops the second to fourth periods, which from old to new are as follows: phyllite, ouartzite, paragneiss, marble, shell, sandstone with tufa, volcanic rocks, crystalline limestone locally with fosolina, metamorphic volcanic and tufa, cherty limestone, phyllite, metamorphic quartzarenite, micaschist, metadolomite, amphibolite, limestone, shale and sandstone, schist hornfels, orthogneiss, granodiorite, oput rock, shale and phyllite sandstone, granite, granodiorite, diorite, dolomitic lime, radiolarit breccia, rodist lime, orbitoline, radiolarat, black and blue marl with limestone, alluvium.
Drill hole GHD007 is oriented toward the NE, and was designed to target the NE edge of Hobbs Pipe 1 near the surface, and then continue on to test the geology beneath historical highly anomalous hornfels metasediment hosted mineralisation.
Not a vestige of mineralization remains in this narrow trench (Figure 13) that slices through highly metamorphosed cherty limestones and shales now altered to marbles, phyllites, and hornfels.
the most favoured material among the Nepean pebbles for the large implements is hornfels, although a wide range of other stones is present'.
Wide zones of low grade gold (Au) and silver (Ag) mineralization, accompanied by widespread propylitic alteration, biotite hornfels and silicification were intersected in a number of drillholes at spatially separate targets including Mabel Jenny, Mabel Jenny North and the Prince of Wales (Table 1).