Plato's description of Atlantis would have fit the ancient hellenic version of Santorini well. It was a large, mountainous, island, with an active volcano at its center. The large settlement on the island was build around said volcano. Poseidon's influence on the island isn't a stretch of the imagination at all; there was sea and ocean all around and from time to time, the entire island would tremble due to the volcano.
The volcano eruption decimated the settlement, but from what archeologists and scholars have been able to piece together, the settlement was a sight to behold while it stood. It had walls eight meters tall, three story houses, beautiful frescos and a rich economic climate. The volcano eruption preserved much of the ancient city of Akrotiri, despite the huge lagoon the eruption left at the center of the island.
One of Atlantis' marvels was the much-praised and highly valuable metal called 'orichalcum'. It was called 'aurichalcum' by the Romans and is a metal mentioned in several ancient writings, including the story of Atlantis in the Critias dialogue, recorded by Plato. In it, he says:
"Some of their buildings were simple, but in others they put together different stones, varying the colour to please the eye, and to be a natural source of delight. The entire circuit of the wall, which went round the outermost zone, they covered with a coating of brass, and the circuit of the next wall they coated with tin, and the third, which encompassed the citadel, flashed with the red light of orichalcum."
The name derives from the Greek ὀρείχαλκος, oreikhalkos (from ὄρος, oros, mountain and χαλκός, chalkos, copper or bronze), meaning literally 'mountain copper' or 'copper mountain'.
In January 2015, a team of divers have discovered dozens of pieces of ancient metal from a shipwreck, aged 2,600 years, off the coast of Sicily island, in the south of Italy. The lumps of metal were arriving to Gela in southern Sicily, possibly coming from Greece or Asia Minor. The ship that was carrying them was likely caught in a storm and sunk just when it was about to enter the port. They were unlike any metal ever found. Analyzed with X-ray fluorescence, the 39 ingots turned to be an alloy made with 75-80 percent copper, 15-20 percent zinc and small percentages of nickel, lead and iron.
The mining of orichalcum would have made Atlantis (or Santorini) very wealthy as it seems the metal was only mined there, and orichalcum was considered second only to gold in value.