And, what are they used for?
what is cordierite made from?
If you are looking for technical ceramics? then. Alumina, used as stucture mateiral in industrial furnace, as they could with stand high temp and relatively cheaper. Boron carbide, extremly hard and not heavy, could be used as bullet proof vest. Silicon nitride, ceramic bearings Zirconia, grinding media There's a lot more pure and mixture materials, such as silicon carbide, magnesium oxides, boron nitrides.
