The natural compound of a metal is called Ores.
silicon oxide- SiO2
the metal with 'hydroxide' on the end, e.g. iron hydroxide.
because metal is seemed hard and unbreakable, this is the image that the artists of that era where trying to portray. That no one could hurt them, they wouldn't go away without a fight, Hope this...
A Mixture of two or more metals is called an alloy.
salt