Meteorite collection 18 May 2022

NWA 7129 (Sahara) – Ungrouped achondrite


Northwest Africa 7129 (NWA 7129)

(Northwest Africa)

Purchased: 2011 Sep

Classification: Ungrouped achondrite

History: Purchased by Gary Fujihara from a Moroccan dealer in September 2011.

Petrography: (A. Irving and S. Kuehner, UWS) Very fresh granular aggregate of very finely exsolved, pinkish-brown pyroxene, polygranular calcic plagioclase, sparse twinned plagioclase laths, ilmenite, minor ferroan olivine, pyrrhotite and Ni-free metal. A blade of baddeleyite was found in one ilmenite grain.

Geochemistry: Olivine (Fa82.2-82.7, FeO/MnO = 81-85), low-Ca pyroxene host (Fs63.9Wo6.0), FeO/MnO = 63) with high-Ca pyroxene lamellae (Fs35.0Wo38.6, FeO/MnO =63), high-Ca pyroxene host (Fs41.1Wo32.1, FeO/MnO = 67) with low-Ca pyroxene lamellae (Fs62.3Wo7.9, FeO/MnO = 66).

Classification: Achondrite, ungrouped. Paired with NWA 011, NWA 2400, NWA 2976, NWA 4587, NWA 4901 and NWA 5644.

Specimens: 10 g of type material and one polished thin section are on deposit at UWB. The remaining material is held by Mr. G. Fujihara.

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