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NWA 6308 (1.55 gram)

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[ Meteoritical Bulletin Database ]

 

Classification: Achondrite, Brachinite W-mod /S-low
Place/Time: 12.2009 in Morocco
Mass: 600g


Physical characteristics: Dark-brownish rock without fusion crust.

Petrography: A sawn surface of the meteorite shows up to 1 mm sized shiny crystals. It displays an equilibrium texture of equally sized olivine (about 80 vol.%) and orthopyroxene with abundant triple junctions between adjoining crystals. Along the grain boundaries symplectic exsolutions of orthopyroxene and Fe-sulfides are frequently observed. Minor phases are chromite and some phosphates.

Geochemistry: olivine: Fa28.5±0.4 (Fa27.8-29.2, n=20, FeO/MnO=63±4); low-Ca pyroxene: Fs25.4±0.1Wo2.2±0.1 (Fs25.1-25.6Wo2.0-2.3, n=20, FeO/MnO=44±3)

Classification: Mineral chemistry, high abundance of olivine, equilibrium texture and grain size are consistent with classification as brachinite.