Quartz IS a mineral, one silicon atom bonded to 4 oxygen atoms tetrahedrally, or two or more SiO2 silicon dioxide molecules with the oxygen atoms covalently bonding to each other to form an hexagonal atomic lattice. Other atoms can be caught in the atomic lattice as inclusions. These atoms can give quartz different colors.
Quartz IS a mineral by definition.
B S. earth sciences/geology, M.S. ABT geophysics, B.S. physical geography, M.S. geology