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NWA 4969 (21.83 gram) Main Mass

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[ Meteoritical Bulletin Database ]

 

Classification: Achondrite, Brachinite S-mod/W-fresh
Place/Time: 08.2007 in Morocco
Mass: 180 gram

History and Physical characteristics: A 180 g incomplete stone was purchased in Erfoud, Morocco, by M. Cimala in 2007. It is partially covered by a thin transparent ablation crust.

Petrography: (J. Wittke and T. Bunch, NAU) Fine- to medium-grained (0.1 to 1.2 mm; mean = 0.75 mm) with protogranular texture. Mineral modes (in vol%): olivine = 89, Ca-pyroxene = 6, plagioclase = 2.5, chromite = 1.5; metal and FeS = 1.

Mineral compositions: Olivine is Fa34.7, FeO/MnO = 72-75; diopside is Fs10.0Wo46.4 (Cr2O3 = 0.88-1.2 wt%; Al2O3 = 1.24 wt%), FeO/MnO = 42; plagioclase is An34.6 and chromite Cr/(Cr + Al) = 0.71. Metal is predominantly taenite (Ni = 20.1 wt%).

Fresh Brahinite with very low shock stage. Full slice, one side polished to the mirror.
This brachinite is not paired with any other classified in NAU.