This 10.40 g specimen of Oued Chebeika 002 belongs to the extremely rare class of CI1 carbonaceous chondrites, widely regarded as the most primitive meteorites known.

Unlike most meteorites, this specimen does not exhibit a typical fusion crust. Instead, its intensely dark surface corresponds directly to its matrix, composed predominantly of fine-grained phyllosilicates and rich in carbon-bearing compounds. This gives the meteorite its distinctive deep black, matte appearance, often mistaken for fusion crust but fundamentally different in nature.

CI chondrites are unique in that their bulk chemical composition closely matches that of the solar photosphere, making them a reference standard in cosmochemistry . They are also characterized by:

• The absence of chondrules and refractory inclusions
• A high degree of aqueous alteration on the parent body
• A matrix dominated by hydrated minerals (phyllosilicates)

Oued Chebeika 002 is particularly significant because it is:

• A recent fall (2024) recovered extremely quickly
• Remarkably pristine, with virtually no terrestrial alteration
• Closer in composition and preservation to Ryugu and Bennu samples than to historical CI meteorites like Orgueil

Its fragility, porosity (~24%), and high sensitivity to water make such specimens exceptionally difficult to preserve, further increasing their rarity and desirability .

🔬 Scientific Significance

CI1 chondrites are among the most important materials in planetary science:

• They represent the best available proxy for the original composition of the Solar System
• They contain water-bearing minerals and organic compounds, crucial for understanding the origin of volatiles and prebiotic chemistry
• They are genetically linked to primitive asteroids such as Ryugu and Bennu

With only a handful of CI meteorites known worldwide, Oued Chebeika 002 is a major addition to this extremely limited group.