Beyond the assignment of meteorites into groups (see above), which is essentially universally accepted, there is no consensus among researchers as to what hierarchy of classification terms is most appropriate. For chondrites, groups may be divided into subgroups where there are features that distinguish certain meteorites from the others in the group, but it is thought that all still come from a single parent body. It is also fairly common for groups that seem to be closely related to each other to be referred to as clans. In turn, groups or clans that appear to be loosely related are often referred to as chondrite classes (e.g., carbonaceous chondrites, enstatite chondrites, and ordinary chondrites). But higher order terms for aggregating groups of meteorites tend to be somewhat chaotic in the scientific and popular literature. There is little agreement on how to fit nonchondritic meteorite groups into an overall scheme.
Several other classification terms are in widespread use:
- Type, a historic top level of classification (see below) that grouped all meteorites into one of four types; chondrite, achondrite, iron or stony-iron.
- Anomalous, meteorites that are members of well-established groups that are different enough in some important property to merit distinction from the other members.
- Grouplet, a provisional group with less than 5 members.
- Duo, a provisional group with only 2 members.
- Ungrouped, meteorites that do not fit any known group, though they may fit into a clan or class (e.g., the meteorite Acfer 094 is in an ungrouped member of the CM-CO clan of carbonaceous chondrites).
Read more about this topic: Meteorite Types
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