(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.
For the computer program, see Vitrite (software). Vitrite, also known as foam glass, is a very low fusing point black glass mainly used for the insulation base of electric lamps. It was formerly made by the Vitrite Company.