Quote:
Originally Posted by JimMorrison
It seems that there was a convergence between the declining availability and quality of copper/bronze, and the gradually increasing knowledge of iron working, that led to the change. It is just conjecture, but from what I'm finding, it sounds like bronze would not have been supplanted by iron until later in history, had supplies of higher quality ore been stable - this is highlighted by the fact that Egypt continued to use bronze almost exclusively for centuries after iron became more prevalent in other regions of the world.
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This is consistent with the mineral availability argument. The gradual change is interesting, though not entirely surprising. However, in some cases, cataclysmic events may have precipitated the change by disrupting trade. Both the fall of the Hittite Empire and the dark period before the emergence of Doric Greece are roughly contemporaneous with the beginning of the Iron Age.
As far as good numbers go, Jim, I think the bronze density is pretty accurate - it reflects a composition of about 12% tin. The number I gave for iron is for pure iron, I think, and not cast iron or meteoritic iron. I don't how many impurities from ores may have been left in the iron from the smelting processes of the Early Iron Age, but if we are willing to assume relatively few, then the density for pure iron may also be quite reasonable.