Around 1400BC in Anatolia (essentially Turkey), Iron was extracted.
This became the seventh metal to be discovered. The metals were grouped as follows, with the idea that metals matured in the earth, beginning with dull lead and ending with shiny gold. It was the start of alchemy….
The seven metals became linked with the seven days of the week:
The ideas behind this article were taken from ‘The Elements’ by Philip Ball ISBN 0-19-284099-1