A metamorphosed coarse grained igneous rock. In this rock you get the recrystallization of quartz, feldspars, micas and amphiboles into bands.

A coarse, foliated metamorphic rock in which bands of granular minerals (commonly quartz and feldspars) alternate with bands of flaky or elongate minerals (e.g., micas, pyroxenes). Generally less than 50% of the minerals are aligned in a parallel orientation.

type of metamorphic rock, 1757, kneiss, from German Gneiss (16c.), which is probably from Middle High German gneist "spark" (so called because the rock glitters), from Old High German gneist [..]

Banded or layered metamorphic rock similar in composition to granite.

a coarse, metamorphosed, foliated (laminated) rock in which feldspars and quartz, sometimes hornblende and mica, run in bands.

A metamorphic rock that changes form after being heated. Gneiss is composed of quartz, mica and other minerals.

A metamorphic rock with a banded or coarsely foliated structure, often called “Trade Granite”. Composed essentially of silicate minerals with interlocking and visibly granular texture in which the fol [..]

(n) a laminated metamorphic rock similar to granite

A coarse-grained regional metamorphic rock that shows compositional banding and parallel alignment of minerals.

A coarse-grained, foliated

A coarse-grained, foliated metamorphic rock that commonly has alternating bands of light and dark-colored minerals.

coarse-grained, granular, banded rock of metamorphic origin.

Banded or layered metamorphic rock, same in composition to Granite.

A metamorphic rock with compositional banding of light and dark minerals, often granitic in composition.

A foliated rock formed by regional metamorphism, in which bands or lenticles of granular minerals alternate with bands or lenticles of minerals with flaky or elongate prismatic habit.

A type of metamorphic rock formed as older rocks recrystallize under heat and stress from pressure characterized by a layering of light and dark bands or streaks.