Quartz

Quartz is a naturally occurring crystalline mineral primarily composed of silicon dioxide (SiO2). It is the second most abundant mineral in the Earth's continental crust. Quartz comes in various forms, including macrocrystalline and cryptocrystalline varieties, and can be used in jewellery, construction, and industrial applications. 

Healing Properties:

Quartz crystals are believed to have various physical, emotional, and spiritual healing properties, including boosting the immune system, promoting mental clarity, and enhancing energy levels. They are also said to amplify other crystals and enhance overall healing.