Iron pyrite is also shiny and pretty, and if it's not as rare as gold, it's still very pretty. But nobody used iron pyrite for jewelry, much, because it's neit

Iron pyrite is also shiny and pretty, and if it's not as rare as gold, it's still very pretty. But nobody used iron pyrite for jewelry, much, because it's neither malleable nor ductile -- properties which make gold useful for wire and leaf, and later turn out to be important for electronics, too.