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. Geodes are hollow, vaguely circular rocks, in which masses of mineral matter, often crystals are secluded.
Country of Origin: Morocco
Price is for a single half geode approx 4.5 to 7cm long.