Found may 16, 2002
CK4 anomalous carbonaceous chondrite
Total mass : 5.4 kg
Specimen in collection :
The meteorite Tanezrouft 057 was discovered by Frédéric Beroud and Christophe Boucher in 2002 in the desert of Tanezrouft, Algeria.
The observation of polished thin sections highlights larges chondrules (approx. 1 mm in diameter), a very abundant dark matrix (approx. 70%) and many irregular refractory inclusions (average size 2 to 3mm), some up to 2 to 3 cm !
Dark inclusions of several centimeters are also visible, showing a more detailed petrological structure substantially free of chondrules or CAIs. Many dark inclusions appear on the surface of the meteorite, which shows no fusion crust.
The analysis, conducted at the National History Museum in Paris, ranked this meteorite first as a C4 carbonaceous chondrite. The composition of the olivine and pyroxene tends to a classification as CK4 while the abundance of dark inclusions and CAIs suggests a CV.
The Tanezrouft 057 meteorite was therefore presented as the missing link between CVs and CK, and a CV4 classification was even proposed.
Finally, in 2006, the meteorite was reclassified as an anomalous CK4.