sentence: Iridium is a metal.
sentences_after: It is very hard to find and costs a lot. Iridium belongs to a group of metals known as transition metals. It looks like platinum and is found in asteroids and comets. It can be used to find out when an asteroid or comet will hit the Earth. It is a very costly metal that can fold and bend just like aluminum.
concept_name: iridium
headings: Iridium
categories: Chemical elements