Meteor-Wrong, Phosphate Slag. This is a piece of slag formed when a molten mass of metal was poured into a bowl-shaped crucible and allowed to solidify. Note the elongate bubbles caused by gases that exsolved during cooling. Pieces of slag from an old foundry or chunks of iron ore (magnetite) are often believed to be meteorites. We call such falsely identified specimens "meteor wrongs." Nearly every professional geologist has caused minor disappointment for someone who thought they had found a meteorite! Specimen provided by FMC Corp., Pocetello, Idaho, USA.