You think probable to sand.
no, sand is heated to make glass :) youtwat.^.^
sand is grinded and then heated and left to moult into glass
Glass
glass
It is the principal component of glass making
Coal
glass
Limestone Sand
In stained glass, they use things in normal glass but add colors and make it thinner.
You can grind glass or plastic. For fun you can make a good lens out of ice.
I only know one material that make good resistor that is STEEL(if not heated)
Fibre glass is a good material to make boats it is a mixture of glass and plastic.