(April 2015) Corruption in Brazil exists on all levels of society from the top echelons of political power (as seen in the MensalÃ£o Scandal and the Operation Car Wash and the Petrobras scandals) to the smallest municipalities.
Quartz sands, which are high in silica content, are used to make glass. When quartz sands are crushed they produce particles with sharp, angular edges that are sometimes used to make sandpaper for smoothing wood. Some quartz sand is found in the form of sandstone.
Over the years, the industry has developed other materials to use for sandblasting instead of sand. These include steel grit, steel shot, glass beads, Black Beauty, and powdered abrasives of varied grades. They have even ground nut shells and corncobs for specific applications and all of these materials produce distinct surface finishes.