Quartz
= Quartz
{wiki=Quartz}
Quartz is a widely abundant mineral composed of silicon dioxide (SiO₂). It is one of the most common minerals in the Earth's crust and can be found in a variety of geological environments. Quartz is characterized by its hardness (it has a rating of 7 on the Mohs scale), which makes it resistant to weathering, and its chemical durability.