Aluminium oxide (British English) or aluminum oxide (American English) is a chemical compound of aluminium and oxygen with the chemical formula 23.
Andalusite is an aluminium nesosilicate mineral with the chemical formula Al2SiO5.
A substance is anhydrous if it contains no water.
Kaolinite is a clay mineral, part of the group of industrial minerals, with the chemical composition Al2Si2O5(OH)4.
Kyanite is a typically blue silicate mineral, commonly found in aluminium-rich metamorphic pegmatites and/or sedimentary rock.
A mineral is a naturally occurring chemical compound, usually of crystalline form and not produced by life processes.
Mullite or porcelainite is a rare silicate mineral of post-clay genesis.
Silicon dioxide, also known as silica (from the Latin silex), is an oxide of silicon with the chemical formula, most commonly found in nature as quartz and in various living organisms.
Sillimanite is an aluminosilicate mineral with the chemical formula Al2SiO5.