from The Meteoritical Bulletin, No. 108
Mass: 332.8 g
Lunar (fragmental breccia)
History: A single weathered stone lacking
fusion crust found in Mali by nomads. Purchased by Dustin Dickens in
Nouakchott, Mauritania, in 2017 from an anonymous meteorite dealer.
Physical characteristics: Dark, sand-blasted exterior, with many irregular shaped
fragments set in a fine-grained dark groundmass. No fusion crust.
Petrography: (T. S. Hayden, M. Anand, OU) The meteorite is clast-rich
fragmental breccia containing numerous mineral fragments and lithic clasts
embedded in a fine-grained, vesiculated (regolith) matrix. The lithic clast
population consists of basaltic clasts, granulite clasts and crystalline
impact-melt breccias of olivine norite compositions. Size range of the
clasts is 0.56-2.56 mm, and the main minerals are pyroxene, feldspar,
olivine, silica, chromite, ilmenite, zircon and Ca phosphates (merrillite
Mineral composition and Geochemistry: (T. S. Hayden, M. Anand, OU) Feldspar (An93.8±2.7,
Ab5.9±2.5, n=39), pigeonite (Fs30.5±9.1Wo13.1±3.4,
FeO/MnO = 59.3±6.6, n=59), augite (Fs23.1±6.1Wo30.9±4.3,
FeO/MnO = 54.2±4.4, n=18), olivine (Fa38.2±11.7, FeO/MnO =
103.2±7.1, n= 40). O isotopes (measured at OU): Repetition 1: δ17O = 3.328‰, δ18O
= 6.361‰, Δ17O=-0.005‰ (linearized using a slope of 0.5247
(of Miller, M. F. (2002) GCA 66(11)), Repetition 2: δ17O =
3.203‰, δ18O = 6.106‰, Δ17O=-0.004‰
(linearized using a slope of 0.5247. Mean: δ17O = 3.266 ±
0.088‰ (1-sigma), δ18O = 6.234 ± 0.180‰ (1-sigma), Δ17O=0.000±0.006‰
Classification: Lunar fragmental regolith breccia.
Specimens: Specimen: 24 g
type specimen held at OU. Dustin
Dickens holds the main mass.