The Meteoritical Bulletin, No.
Mass: 1420 g
single weathered stone lacking a fusion crust was found by nomads in
Algeria and purchased by Dustin Dickens in Nouakchott, Mauritania in 2017
from an anonymous meteorite dealer.
Physical characteristics: Dark
grey sandblasted exterior, with many irregular shaped fragments set in a
fine grained vesiculated groundmass. No fusion crust.
S. Hayden, M. Anand, OU) The
meteorite is a clast-rich fragmental breccia containing numerous mineral
and lithic fragments embedded in a fine-grained vesiculated (regolith)
matrix. The lithic clast population consists primarily of basaltic clasts,
dominated by Ca-rich pyroxene and plagioclase, with minor olivine
components. The size range of the lithic clasts is 0.19-1.9 mm. Mineral
clasts are mainly pyroxene, olivine, plagioclase, chromite, troilite and
Fe-Ni phases. Some impact melt textures present also.
Mineral composition and
(T. S. Hayden, M. Anand, OU)
Feldspar (An95.2±0.7Ab4.7±0.7, N = 31), Pigeonite (Fs43±3.3Wo9.5±4.4,
Fe/Mn=65.5±3.3, N=45), Augite (Fs25±4.8Wo35.7±6.1,
Fe/Mn=59.5±5.6, N=54), Clinoferrosilite (Fs48.6Wo5,
Fe/Mn = 67.4, N=1), Clinoenstatite (Fs44.5±4.3Wo4.4,
Fe/Mn = 64.7±3.9, N=11), Olivine (Fa47.6±16, Fe/Mn=104.5±10.8,
N=33). O isotopes (measured at OU): Repetition 1: δ17O =
3.266‰, δ18O = 6.333‰, Δ17O=-0.052
(linearized using a slope of 0.5247), Repetition 2: δ17O =
3.217‰, δ18O = 6.174‰, Δ17O=-0.018‰
(linearized using a slope of 0.5247. Mean:
3.242 ± 0.035‰ (1-sigma), δ18O =
6.254 ± 0.112‰ (1-sigma), Δ17O=-0.035±0.024
Classification: Lunar fragmental regolith breccia.
Specimens: Specimen: 20 g specimen held at OU. Dustin Dickens holds the main mass.