1cm
The particle size of gneiss can vary, but it typically consists of medium to coarse-grained minerals that are visible to the naked eye. Gneiss is a metamorphic rock formed from the recrystallization of pre-existing rocks under high heat and pressure, resulting in a distinctive banded texture.
It varies some metamorphic rocks are fine grained (eg slate) and others have very large crystals (eg an augen gneiss).
It can be either. The kind of rock does not dictate size.
Gneiss is a metamorphic rock that forms from the recrystallization of pre-existing rocks under high temperature and pressure conditions. It is characterized by its banded texture and coarser grain size compared to other types of metamorphic rocks.
A Gneiss is a Metamorphic rock
Gneiss is foliated.
Gneiss is foliated and coarse grained
Gneiss is a rock, not a mineral.
No, gneiss is metamorphic.
Gneiss is a part of the earths lower crust. No matter where you drill you will eventually uncover gneiss.
No. Phyllite can metamorphose into schist and then into gneiss.
No. Gneiss has alternating light and dark bands.