
quartzite stone as road material quartzite above is a metamorphic rock made from heating up sandstone under pressureit fuses all those quartz sand grains together into an interlocking network of quartz,quartzite concrete materials,quartzite - concrete materials. quartzite rock is a hard, non-foliated metamorphic rock which was originally pure quartz sandstone and is found in eastern south dakota amongst other places throughout the united states.