There are many different varieties of quartz, several of which are classified as gemstones. Since antiquity, varieties of quartz have been the most commonly used minerals in the making of jewelry …

Dec 31, 2025 · Quartz, widely distributed mineral of many varieties that consists primarily of silica, or silicon dioxide. Minor impurities such as lithium, sodium, potassium, and titanium may be present. …

Quartz is a mineral composed of silicon and oxygen, with a chemical composition of SiO 2. It is the most abundant mineral in Earth's crust and is resistant to both chemical and physical weathering.

May 20, 2025 · Natural quartz is a crystalline mineral composed primarily of silicon dioxide (SiO₂). It forms deep within the Earth’s crust under high pressure and temperature, resulting in hard, …

Apr 22, 2018 · Explore quartz (SiO₂): its atomic structure, formation, varieties, and technological applications. Learn why quartz is one of Earth’s most important and versatile minerals.

As a mineral name, quartz refers to a specific chemical compound (silicon dioxide, or silica, SiO 2), having a specific crystalline form (hexagonal). It is found in all forms of rock: igneous, metamorphic …

Composed of silicon and oxygen atoms, quartz is the second most abundant mineral in the planet’s crust. It is present in granite and other igneous rocks and is common in sedimentary rocks, such as …