(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.
Glass is manufactured primarily from the mineral quartz (SiO2) which is what sand is made from. However small amounts of other minerals are added to the sand to make the process easier.These minerals are:-.sodium carbonate (Na2CO3). lime (calcium oxide (CaO).magnesium oxide (MgO).aluminum oxide (Al2O3).lass is manufactured primarily from the mineral quartz (SiO2) which is what sand is made from. However small amounts of other minerals are added to the sand to make the process easier. These minerals are:-. sodium carbonate (Na2CO3). lime (calcium oxide (CaO). magnesium oxide (MgO). aluminum oxide (Al2O3).