Ungrouped Iron Meteorites
More than 110 iron meteorites have never been chemically classified, while another 100 have been classified as ungrouped irons. The latter don’t fit into any of the existing 14 chemical groups, and display unique structural and elemental compositions.
Some of these ungrouped irons have similar compositions to others, and they have been provisionally placed into several grouplets comprising less than five members each, e.g., the Prambanan grouplet, and the Cambria grouplet. The remaining ungrouped irons are unique, and they probably represent singular samples of their parent bodies. Some of the largest irons have been classified as ungrouped, e.g., Bacubirito, and Mbosi, just to name a few.