sentence: Iridium is the most corrosion resistant metal.
sentences_before: 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. It is very shiny. It is relatively rare on the Earth's crust. Most Iridium is found in Brazil, Canada, Myanmar, Russia, South Africa, and the United States.
concept_name: iridium
headings: Iridium
categories: Chemical elements