Metals from the Ages #2: Bronze Age
After the Copper Age came the Bronze Age. Again, it was a “mix (of) history, geography, physics, geology, and chemistry”, explains Tomas Pueyo in his post . But we are getting ahead of ourselves. First mankind had to find tin and lead. Why those two? Again, from chemistry, same column (group) = similar chemical properties. In this case: “Because you can make them in a normal fire pit!” Lead melts at 327° C. A wood fire easily reaches 600-800° C. If the ore of lead found itself in a pit fire, the lead got separated. “But lead is not very useful because it’s heavy and way too soft. It couldn’t work as a tool or as a hand-held weapon.” The common ore of lead, galena, has traces of silver. It is likely that humans began to smelt galena for the silver and lead was just a byproduct. ~~ Tin has an even lower melting point of 232° C. But it is brittle and rare, hardly a candidate for a useful metal. But in many copper mines, tin is also present. And c...