what is quartzite
Quartzite is a nonfoliated metamorphic rock composed almost entirely of quartz. It forms when a quartz-rich sandstone, is altered by the heat, pressure, and chemical activity of metamorphism. These conditions recrystallize the sand grains and the silica cement that binds them together.uartzite: A specimen of quartzite showing its conchoidal fracture and granular texture. The specimen shown is about two inches (five centimeters) across.