A Gneiss is a Metamorphic rock
Gneiss is a rock, not a mineral.
Metamorphic
Metamorphic, because it is formed with heat and pressure
Gneiss is foliated.
No, gneiss is metamorphic.
Gneiss is foliated and coarse grained
Gneiss is a part of the earths lower crust. No matter where you drill you will eventually uncover gneiss.
No. Gneiss has alternating light and dark bands.
No. Phyllite can metamorphose into schist and then into gneiss.
No. Gneiss is a metamorphic rock.
Yes, gneiss will split with a hammer.
The Mica mineral can change to the mineral group known as amphiboles when Gneiss is formed. This transformation occurs due to the high pressure and temperature conditions during the metamorphic process.