Quartzite is metamorphosed from which one of the following rocks?

Quartzite is a hard, non-foliated metamorphic rock which was originally pure quartz sandstone.

Sandstone is converted into quartzite through heating and pressure usually related to tectonic compression within orogenic belts.

Limestone metamorphoses into marble, while shale metamorphoses into slate, phyllite, schist, or gneiss.

Answer: Sandstone