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NWA 7533, Black Beauty ASK FOR PRICE

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NWA 7533, Black Beauty

Martian meteorite

End piece

Weight: 3.37 g

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Northwest Africa 7533 (NWA 7533)

 

Petrography: (R. Hewins, MNHNP) Breccia, largest objects (~1 cm) are flattened, oval or curved fine-grained melt bodies containing crystal fragments, often with melt mantles or coatings. The melt rocks have a fine-grained subophitic to fasciculate texture (grain size 2-5 μm) and are characterized by clots with central oxides (magnetite, chromite or ilmenite) in a mass of pyroxene dendrites embedded in aureoles of plagioclase. Clasts (to ~2 mm) are dominantly crystal clasts of pyroxenes and feldspars, with magnetite and chlorapatite, small coarse-grained noritic-monzonitic fragments (>1 mm grains) made up of several of these phases, microbasalts with subophitic to granoblastic textures (grain size 1-5 μm) and melt spheres (~100 μm to >3 mm). Pyroxenes include orthopyroxene, inverted pigeonite, pigeonite (in microbasalts), and augite. Feldspars include plagioclase, anorthoclase, orthoclase and perthite. Inverted pigeonite contains 10 μm exsolution lamellae.

 

Probably paired with NWA 7034. The oxygen isotopic values are identical to those of that ungrouped achondrite breccia, and the range of mineral compositions of the two meteorites are very similar. Some of the pyroxene compositions are also very close to those of ALH 84001.

Specimens: 17 g, MNHNP, main mass with finder

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