Coolidge grouplet

The Coolidge grouplet, named for the meteorite of Coolidge that was found in Kansas, USA, in 1937, is a good example for such a “group in progress”. Together with our own desert find, Sahara 00177, there are at least three other carbonaceous chondrites – officially designated as C UNGR – that show a similar high matrix to chondrule ratio as Coolidge as well as the same enrichment in refractory elements. Maybe this grouplet will gain the status of a fully accepted group as soon as new members are found and recognized in the wealth of new meteorite finds from the hot deserts of Africa and Asia, as well as from the blue-ice fields of Antarctica.