Metals from the Ages #1: Copper Age
Tomas Pueyo wrote this excellent post on how metals shaped human civilization. A “mix of history, geography, physics, geology, and chemistry”, as he calls it. The first 3 metals used by humans were… he points to the Periodic Table! Gold, silver and copper. Why those three? Because, to recap chemistry, same column (group) = similar chemical properties. The similar property of relevance here is that they can all be found in “native” form, i.e., pure form. ~~ When rocks erode, the heavier and inert gold gets left behind, which is why we found gold first. Gold was valuable because it is rare, malleable, doesn’t oxidize, found in nuggets, and yes, shiny. All those characteristics meant it became a store of value. But it was too heavy, too malleable, so it was of no use to make tools. Silver is more common than gold. But it tarnishes (it reacts with other things). Which is why it is harder to find in native form. Again, not of much practical use. ...