(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.
Best Answer: 4 main ingredients? The major ingredient for glass making is silica, in the form of sand. Only sand of exceptional purity can be used to make glass. If the sand contains a trace of iron, for instance, the glass made with it will have a greenish color. Even for ordinary window glass, sand must be better than 99 percent pure silica, perfectly white, and not too fine.