The objects that trace their origins to outer space also predate the emergence of iron smelting by two millennia.
Carefully hammered into thin sheets before being rolled into tubes, the nine beads - which are over 5000 years-old - were originally strung into a necklace together with other exotic minerals like gold and gemstones, revealing the high value of this exotic material in ancient times.
Lead author Professor Thilo Rehren (UCL Archaeology, Qatar), said that the shape of the beads was obtained by smithing and rolling, most likely involving multiple cycles of hammering, and not by the traditional stone-working techniques such as carving or drilling which were used for the other beads found in the same tomb.
The team's results show that in the fourth millennium BC metalworkers had already mastered the smithing of meteoritic iron, an iron-nickel alloy much harder and more brittle than the more commonly worked copper, developing techniques that went on to define the iron age.
As a result metalworkers had already nearly two millennia of experience of working with meteoritic iron when iron smelting was introduced in the mid-second millennium BC.
This knowledge was essential for the development of iron smelting and the production of iron from iron ore, enabling iron to replace copper and bronze as the main metals used.
Excavated in 1911, in a pre-dynastic cemetery near the village of el-Gerzeh in Lower Egypt, the beads were already completely corroded when they were discovered.
As a result, the team used x-ray methods to determine whether the beads were actually meteoric iron, and not magnetite, which can often be mistaken to be corroded iron due to similar properties.
By scanning the beads with beam of neutrons and gamma-rays, the team were able to reveal the unique texture and also high concentration of nickel, cobalt, phosphorous and germanium - which is only found in trace amounts in iron derived from ore - that is characteristics of meteoric iron, without having to attempt invasive analysis which could potentially damage these rare objects.
Professor Rehren said that the outcome of this research is that they were for the first time able to demonstrate conclusively that there are typical trace elements like cobalt and germanium present in these beads, at levels occurring only in meteoritic iron.
The study has been published in the Journal of Archaeological Science.
--ANI (Posted on 20-08-2013)