Northwest Africa 6828 meteorite (NWA 6828), Northwest Africa Meteorites
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|Non-native locality type:||Meteorite|
|Meteorite Type:||R3-6 chondrite|
Chondrite (R3-6; S1; W0/1)
Found 2009; 47 g, 3 pieces.
The NWA 6828 meteorite is a small, but relatively intact meteorite which still retains most of its original fusion crust. As a breccia with disparate equilibrated and unequilibrated regions it consists mostly of various and (usually lightly shocked) lithic fragments embedded in a fine-grained clastic matrix. A few clasts have been melted. Olivine dominates all lithologies — equilibrated regions, unequilibrated regions, and matrix. The olivine (Fa37.8 ) in equilibrated regions is diagnostic for NWA 6828's classification as an R (Rumuruti-like) chondrite. In non-equilibrated lithologies both olivine (Fa 0.3-57.8) and low-Ca pyroxene(s2.8-28.8) are variable and often zoned. Other phases — in rough order of abundance — include albitic plagioclase, phosphates, chromite, sulfides and rare metallic Fe-Ni.
A very unusual hydrated clast (.4 mm x .3mm) contains phyllosilicates (apparently serpentine-rich), nearly pure magnetite, carbonates, and rare Andreyivanovite (FeCrP). The clast does not appear to match previous hydrous regions or clasts previously reported in other Carbonaceous Chondrites.
Like many of the Northwest Africa meteorites, the actual site of the fall is unknown to the meteoritical community.
8 valid minerals.
Meteorite/Rock Types Recorded
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Greshake, A. (2014) A strongly hydrated microclast in the Rumuruti chondrite NWA 6828: Implications for the distribution of hydrous material in the solar system. Meteoritics & Planetary Science 49 (5): 824-841. (May 2014)