(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.
Soda-lime glass is used for windows, bottles, etc., and is easily formed and shaped. Borosilicate glass (known commercially as Pyrex) is used for cooking and chemical glassware because of its strength at high temperatures, low coefficient of expansion, and good thermal shock resistance.