NWA 13777 is a rare CK6-an Carbonaceous Chondrite purchased in Nouadhibou, Mauritania, in early 2021. The CK group is known for Carbonaceous meteorites that have experienced significant thermal metamorphism, and the type 6 classification indicates a high degree of recrystallisation on the parent body. The ‘an’ designation marks it as anomalous, meaning it differs in some respects from typical CK6 material, adding further scientific and collector interest.

NWA 13777 specimens are described as dark greyish rock without fusion crust. As a highly metamorphosed Carbonaceous Chondrite, visible chondrules may be subdued or difficult to distinguish, with the texture generally more compact and recrystallised than less altered Carbonaceous material. This gives it a more uniform appearance while still preserving the chemical character of an ancient Carbonaceous parent body.

Studying NWA 13777 provides insight into the effects of heat on primitive Carbonaceous material and the diversity of CK group meteorites. Its anomalous CK6-an status, Northwest African provenance, and thermally altered character make it especially appealing for collections focused on Carbonaceous Chondrites, rare classifications, or altered early solar system material. Each specimen represents primitive asteroid material that has been significantly transformed by heat over billions of years.