1.25g part slice. Sold with label / certificate of authenticity.
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Northwest Africa 8791 (NWA 8791)
Purchased: 2011 Jun
Classification: Rumuruti chondrite (R3-5)
History: Purchased by Fabien Kuntz in June 2011 from a Moroccan dealer at the Ensisheim Show.
Physical characteristics: Single stone (241 g) with an overall light-brown color and composed of small clasts in a finer-grained matrix.
Petrography: (A. Irving and S. Kuehner, UWS) Breccia consisting of equilibrated Type 5 clasts (containing sparse chondrules), separated well-formed, forsterite-bearing Type 3 chondrules ((apparent diameter 470±210 μm)) and angular mineral fragments in a finer grained matrix (orange-brown in thin section). Accessory minerals include Ti-V-Al-bearing chromite, troilite, Ni-bearing pyrrhotite and minor altered kamacite.
Geochemistry: Olivine in Type 5 clasts (Fa39.2-39.9, N = 3), magnesian olivine in Type 3 chondrules (Fa3.2-4.5, N = 2), orthopyroxene (Fs2.2-30.3Wo0.2-3.2, N = 3), augite (Fs27.7Wo39.2; Fs12.1Wo44.0, N = 2), fayalite (Fa71.4).
Classification: R3-5 chondrite.
Specimens: 21.2 g plus one polished thin section at PSF; 21.29 g at MGC; main mass with Kuntz.