paragneiss

geology

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July 23, 2026

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Paragneiss is a type of gneiss, which is a metamorphic rock characterized by distinct banding. Specifically, paragneiss originates from the metamorphism of sedimentary rocks. Gneiss, in general, is medium to coarse-grained and often contains quartz and feldspar. Its banding is typically caused by the separation of dark (mafic) and light (felsic) minerals, or by variations in grain size. The mineral composition of gneiss is influenced by the original rock type, as well as the pressure, temperature, and chemical changes during metamorphism.12

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Precambrian
Granulite-gneiss rock types
These types include schists and paragneisses that were originally deposited on the Earth’s surface as shales and which now contain high-temperature metamorphic minerals such as biotite, garnet, cordierite, staurolite, sillimanite, or kyanite. There also are quartzites, which were once sandstones
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These types include schists and paragneisses that were originally deposited on the Earth’s surface as shales and which now contain high-temperature metamorphic minerals such as biotite, garnet, cordierite, staurolite, sillimanite, or kyanite. There also are quartzites, which were once sandstones
Read More