About: http://webisa.webdatacommons.org/274612236

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	It is a mixture of Magnesium and alloy which is often aluminum, zinc, copper, silicon, zirconium and other minerals, and to answer your question why not aluminum?
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com