Northwest Africa 11179 (NWA 11179)

Morocco

Purchased: 2015

Classification: Carbonaceous chondrite (CM2)

History: the meteorite was purchased in the Tucson Mineral Show, January 2015 from a Moroccan meteorite dealer

Physical characteristics: 25 samples of meteorite and their fragments weighing 337.6 g. The samples have dark-brown fusion crust, a surface of section has a gray-greenish color.

Petrography: (M. A. Ivanova, Vernad): The meteorite consists of the altered matrix, POP, rare BO chondrules and their fragments, olivine aggregates with a fine-grained matrix rim around, and refractory inclusions. Main minerals are olivine and pyroxene; minor minerals are very rare sulfides, Fe,Ni-metal and chromite. The phyllosilicate matrix contains isolated grains of olivine and pyroxene. The meteorite is weathered, only rare kamacite, taenite and sulfide were preserved.

Geochemistry: Mineral compositions and geochemistry (EMPA, Vernad): Olivine: Fa_0.3-68.4, CaO 0.28 wt.%, Cr₂O₃ 0.31 wt.% (n=45). Orthopyroxene Fs_0.8-3.9Wo_0.2-3.8 (n=18), augite Fs_0.8-2.8Wo_31.3-46.6 (n=7), pigeonite Fs_14.3Wo_20.2, and diopside Fs_1.3Wo_57.9. Oxygen isotopes (Laser fluorination, OU): δ¹⁷O 0.721, δ¹⁸O 7.901, Δ¹⁷O -3.388; δ¹⁷O 0.585, δ¹⁸O 7.796, Δ¹⁷O -3.469 per mil.

Classification: carbonaceous chondrite, CM2

Specimens: 15 samples with their fragments of the meteorite (4.7+5.4+4.6+2.3+0.3+0.07+ 1.9+0.3+0.06+0.9+0.1+ 1.2+3.3+0.5+0.8+4+0.7+2.2+ 2.6+0.4+1.44+1.03+1.65+0.281 g) of 40.7 g in total and a polished section are located at Vernad, the main mass with anonymous owner.