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Northwest Africa ( NWA ) 5958 is a carbonaceous chondrite found in Morocco in 2009. Preliminary chemical and isotopic data leading to its initial classification as C3.0 ungrouped have prompted us to conduct a multitechnique study of this meteorite and present a general description here. The petrography and chemistry of  NWA  5958 is most similar to a  CM  chondrite, with a low degree of aqueous alteration, apparently under oxidizing conditions, and evidence of a second, limited alteration episode manifested by alteration fronts. The oxygen isotopic composition, with ∆' 17 O = −4.3‰, is more  16 O‐rich than all  CM  chondrites, indicating, along with other compositional arguments, a separate parent body of origin. We suggest that  NWA  5958 be reclassified as an ungrouped carbonaceous chondrite related to the  CM  group.

Northwest Africa 5958: A weakly altered CM ‐related ungrouped chondrite, not a CI 3