Quartzite

Quartzite is a hard metamorphic rock which starts out as sandstone and is converted into quartzite through heating and pressure related to tectonic compression. Its density makes it mostly resistant to erosion and volatile weather.

Pure quartzite is usually white to gray, though quartzites often occur in various shades of pink and red due to varying amounts of iron oxide.

Quartzite can be used to cover walls, as roofing tiles, flooring and stair steps but is often simply used for decoration and countertops.