metaquartzite

Metaquartzite is a type of quartzite that forms from sandstone through recrystallization under high temperatures and pressures. Unlike regular quartzites, metaquartzites are pore-free and break through sand grains rather than around them, creating a smooth fracture surface. These rocks are typically white, pink, or gray and weather slowly, often forming resistant hills and mountain masses.1

Pure metaquartzites, containing 90-99% quartz, are valuable sources of silica for metallurgical purposes and the production of silica bricks. They are also quarried for various construction and infrastructure uses, including paving blocks, road metal, and railroad ballast.1