Iron meteorites represent the largest group of all meteorite findings outside of the hot deserts of Africa and Asia and the ice of the Antarctica, as they can be recognized by layman by their metallic consistence and their heavy weight easily as meteorites. Moreover they weather slower than their stony relatives and are mostly much bigger, because they are compact and more stable and therefore rarely burst on their passage through the atmosphere as well as when they bounce on the earth. You find a list of the giants of the iron meteorites in the section Records.
In spite of this and the fact that all iron meteorites with a total weight of more than 300 tons come up to more than 80% of the total mass of all well known meteorites, they are however comparatively rare. Iron meteorites frequently are found and easily identified as meteorites, but nevertheless they make out merely 5,7% of all watched falls.
Concerning classification, iron meteorites are divided according to two completely different schemes into groups. The first scheme is a sort of relic from the times of classic meteorite science and distinguishes iron meteorites according to their structure and their prevailing mineral consistence, the second scheme is rather a modern attempt, dividing iron meteorites into chemical classes and thus trying to relate them to certain mother bodies.