A chemical-petrologic classification for the chondritic meteorites

A two-dimensional classification grid based on chemical and petrologic subdivisions of the chondritic meteorites is proposed. This grid extends the current chemical subdivisions to account for varying petrologic (implied metamorphic) properties of chondrites within the primary chemical groups. Six petrologic types are recognized, which, together with the five major chemical groups, produce 30 possible chondritic types. Representatives of 20 of the types are known. An Appendix giving the extended classification for 460 chondrites is included.