|from The Meteoritical Bulletin, No. 106 |
Northwest Africa 11182 (NWA 11182)
Lunar Meteorite (feldspathic breccia)
History: Purchased by Ruben Garcia from Said Haddany in Tucson, 2017.
Physical characteristics: Single stone, no fusion crust. A saw cut reveals a fragmental breccia with numerous white feldspathic clasts and fine-grained lithic fragments, set in a dark-gray ground mass.
Petrography: (C. Agee, UNM) This meteorite consists of primarily feldspathic clasts, microgabbro clasts, and shock melt, some containing vesicles.
Geochemistry: (C. Agee and B. Ha, UNM) pigeonite Fs28.9±1.6Wo11.8±7.0, Fe/Mn=56±3, n=2; high Ca pyroxene Fs22.7±11.7Wo28.6±5.9, Fe/Mn=52±2, n=2; two olivine grains were found: Fa16.9 and Fa34.6 with Fe/Mn=91 and 98 respectively; plagioclase An92.9±3.2Ab6.8±3.2Or0.3±0.1, n=4.
Classification: Lunar feldspathic breccia.
Specimens: 12 g plus a probe mount on deposit at UNM, Ruben Garcia holds the main mass.
The specked white clast is richer in REE as well as more mafic that the matrix. This is 1 of only 5 lunar meteorites that I know to have a significant negative cerium (Ce) anomaly. All are from Northwest Africa (other 4: NWA 10318, NWA 10495, NWA 11223/11809, and Tichiya). Both the matrix and the clast have Ce anomalies, but the magnitude of the anomalies varies considerably. Pr and Nd values calculated by interpolation between La and Sm. Dy, Ho, Er, and Tm values interpolated between Tb and Yb. The Gd value is the mean of the La-Sm extrapolation, the Sm-Tb interpolation, and the Yb-Tb extrapolation.
Meteoritical Bulletin Database
Korotev R. L. and Irving A. J. (2021) Lunar meteorites from northern Africa.Meteoritics & Planetary Science, 206–240.