Banded metamorphic rock of granitic composition with alternating light felsic and dark mafic layers. Texture: Gneissose banded. Rock type: Metamorphic High-grade. Grain size: Coarse. Parent rock: Granite orthogneiss or Sediment paragneiss. Minerals present: Quartz, Feldspar, Biotite, Hornblende, Garnet. Formation: Forms from high-grade metamorphism of granitic rocks orthogneiss or felsic sediments paragneiss . Common geological settings: Found in deeply eroded mountain belts and Precambrian shields worldwide. Common look-alikes and related entries: Granite, Migmatite, Schist.
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Last updated
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Rocks — U.S. National Park Service. Authoritative overview of rock groups, the rock cycle, and geologic processes.
Banded metamorphic rock of granitic composition with alternating light felsic and dark mafic layers.
How can you identify Granitic Gneiss?
Compare several properties rather than relying on colour alone. This entry records rock type: Metamorphic High-grade; texture: Gneissose banded; grain size: Coarse; common minerals: Quartz, Feldspar, Biotite, Hornblende, Garnet. Confirm an important identification with additional field tests or qualified laboratory work.
How does Granitic Gneiss form?
Forms from high-grade metamorphism of granitic rocks orthogneiss or felsic sediments paragneiss .
Where is Granitic Gneiss commonly found?
Found in deeply eroded mountain belts and Precambrian shields worldwide.
What is Granitic Gneiss commonly confused with?
Granitic Gneiss may be confused with Granite, Migmatite, Schist. Compare multiple diagnostic properties because colour and surface appearance can overlap.
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