Understanding Gneiss: A Metamorphic Rock Formed by Pressure and Heat

Gneiss is a type of metamorphic rock that forms when other rocks, such as granite or schist, are subjected to high pressure and temperature conditions. This process can occur over millions of years, as the rock is buried deep within the Earth's crust and subjected to tectonic forces.

Gneiss is characterized by its banded or layered appearance, which is due to the presence of minerals that have undergone changes in their composition and structure during the metamorphism process. The bands or layers can be composed of different minerals, such as quartz, feldspar, mica, and amphibole, which give the rock a distinctive appearance.

Gneiss is a common rock type found in many parts of the world, including mountain ranges, plateaus, and other geological formations. It is often used as a building material, and its durability and resistance to weathering make it a popular choice for outdoor applications such as paving and landscaping.