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Aluminium makes up about 8% of the crust by mass, though it is less common in the mantle below.
Aluminium metal is so chemically reactive that native specimens are rare and limited to extreme reducing environments.
Aluminium has about one-third the density and stiffness of steel. Aluminium atoms are arranged in a face-centered cubic (fcc) structure.
Aluminium has a stacking-fault energy of approximately 200 m J/m Aluminium is a good thermal and electrical conductor, having 59% the conductivity of copper, both thermal and electrical, while having only 30% of copper's density.
Aluminium is a relatively soft, durable, lightweight, ductile, and malleable metal with appearance ranging from silvery to dull gray, depending on the surface roughness. A fresh film of aluminium serves as a good reflector (approximately 92%) of visible light and an excellent reflector (as much as 98%) of medium and far infrared radiation.