Quartz is a mineral composed of silicon and oxygen atoms 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. For believers of its healing power, it's ideally used for Crown Chakra. Care Instructions Detergents and lotions can damage the finishing and colour of the stones / crystals. * Clean with soft 100% cotton. Disclaimer: The information provided is intended as a reference of the metaphysical and healing energies of the crystals. Their healing powers are not established and cannot be guaranteed. Crystals should never be used as a substitute for conventional medical or psychological treatment.