NWA 3151 BRA
Meteorite Name
NWA 3151
Found 2005, North West Africa
Weathering &
Shock Level
Specimen Type
1 polished thin section, 1 covered thin section
History: A 1500 g complete stone with a thin, translucent crust was purchased by G. Hupé in
Tagounite, Morocco, in April 2005.

Petrography and Geochemistry: (A. Irving and S. Kuehner, UWS) Coarse-grained dunitic rock
(grain size 0.7–1.6 mm) with protogranular texture, composed predominantly of olivine (Fa35.
7; FeO/MnO = 81; 95 vol%) with minor clinopyroxene (Fs10.5–10.6Wo44.7–45.2; FeO/MnO =
44; Cr2O3 = 0.65 Al2O3 = 0.95 [both wt%]), altered metal (with some relict taenite), troilite,
chromite (Cr/(Cr+Al) = 0.727–0.731) with very rare K-poor, sodic plagioclase (An36.2–39.9
Or0.2), and orthopyroxene. Although the silicate minerals are fresh, terrestrial weathering has
altered some of the primary metal to hydroxides, which also form thin coatings along grain
boundaries. Oxygen isotopes: (D. Rumble, CIW) Replicate analyses of acid-washed whole
rock samples by laser fluorination gave δ18O = +4.86 ± 0.03, δ17O = +2.42 ± 0.02, ∆17O =
−0.15 ± 0.02 (all ‰).

Classification: Achondrite (brachinite).

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Copyright 2008
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