(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.
Using a Furnace or Kiln. 1  1. Obtain silica sand. 2  2. Add sodium carbonate and calcium oxide to the sand. 3  3. Add other chemicals, depending on the glass's intended purpose.  4. Add chemicals to produce a desired color in the glass, if 1  any. 5. Place the mixture in a good heat-resistant crucible or holder.  6. Melt the mixture into a liquid. For commercial silica glass, this is done in a gas-fired furnace, while specialty glasses may be created using an electric melter, pot furnace or kiln. Quartz sand without additives becomes glass at a temperature of 2,300 degrees Celsius (4,172 degrees Fahrenheit).