Quartzite is a hard, nonfoliated metamorphic rock which was originally pure quartz sandstone. Sandstone is converted into quartzite through heating and pressure usually related to tectonic compression within orogenic quartzite is usually white to grey, though quartzites often occur in various shades of pink and red due to varying amounts of iron oxide (Fe 2 O 3).
While the demand for quartzite is less than other types of dimensional stone, demand for the stone still exceeds its production. The use of quartzite as crushed stone is generally limited to areas where it is more readily available than other types of material. Quartzite forms through the metamorphosis of quartz sandstone.