Quartz is a hard, crystalline mineral composed of silica (silicon dioxide). The atoms are linked in a continuous framework of SiO4 silicon-oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO2. Quartz is the second most abundant mineral in Earth's continental crust, behind feldspar. Quartz exists in two forms, the normal ?-quartz and the high-temperature ?-quartz, both of which are chiral. The transformation from ?-quartz to ?-quartz takes place abruptly at 573 °C (846 K; 1,063 °F). Since the transformation is accompanied by a significant change in volume, it can easily induce fracturing of ceramics or rocks passing through this temperature threshold. There are many different varieties of quartz, several of which are classified gemstones. Since antiquity, varieties of quartz have been the most commonly used minerals in the making of jewelry and hardstone carvings, especially in Eurasia.
All items listed with descriptions of metaphysical and energy work should not be used in place of medical advice or treatment. Using these items does not mean it will heal, treat, or cure any health concerns or diseases. All medical concerns should be brought to the attention of a licensed healthcare professional.