Other characteristics, lattice: hexagonal, Piezoelectric, may be triboluminescent, chiral (hence optically active if not racemic). References. Quartz is a mineral composed of silicon and oxygen atoms in a continuous framework of SiO4 ..... is an amorphous silica glass SiO2 which is formed by lightning strikes in quartz sand.
Sand is a naturally occurring granular material composed of finely divided rock and mineral .... Quartz sand that is recently weathered from granite or gneiss quartz crystals will be angular. ... Sand that is transported long distances by water or wind will be rounded, with characteristic abrasion patterns on the grain surface.