The first thing Aster bought in the auction was that ore which the auctioneer claimed was black iron, with a price that was obviously ridiculous for such a low ranked material, but which Camila affirmed it to be star obsidian.
Star obsidian and black iron in their crude state do look similar, but the difference is that star obsidian when refined it becomes a pitch-black mineral, the price of an ore of a kilogram was of fifty thousand middle grade spirit jades.
But that is the price of the ore in its crude state, so far, the luckiest person that has gotten a hold of an ore of star obsidian, only managed to get around 50 grams from of the mineral after refining it, the rest were other minerals that gather around the star obsidian, which is the reason as to why it looks similar to black iron, as the same phenomenon applies to it.