Is “Quartz” classified as Metamorphic, Sedimentary or Igneous rock??
Quartz is a mineral, not a rock. Many sedimentary, igneous, and metamorphic rocks contain a lot of quartz, but that by itslef doesn’t make quartz a rock. A variably metamorphosed sedimentary rock called orthoquartzite (depending on whose definition you use) consists of almost all quartz, and there can be some rare igneous and metamorphic rocks composed of almost all quartz. Quartz is not a rock, and therefore it is not possible to classify it classify quartz as sedimentary, igneous, or metamorphic. Hope that helps!
