Original sentence: Aluminium is ordinarily classified as a metal.It has some properties that are unusual for a metal; taken together, these are sometimes used as a basis to classify aluminium as a metalloid.It is lustrous, malleable and ductile, and has high electrical and thermal conductivity.Like most metals it has a close-packed crystalline structure,  and forms a cation in aqueous solution.The oxide Al2O3 is amphoteric, and a conditional glass-former
Edited sentence: Aluminium is a metal, which is lustrous, malleable and ductile, has high electrical and thermal conductivity, and a close-packed crystalline structure.It also has some properties that are unusual for a metal; taken together, these properties are sometimes used as a basis to classify aluminium as a metalloid.Its oxide is amphoteric, and a conditional glass-former