Northwest Africa 4884 Lunar Meteorite

Complete slice of NWA 4884.
Complete slice of NWA 4884.


Official Meteoritical Bulletin entry for Northwest Africa 4884:

Northwest Africa 4884
     Northwest Africa
     Find: July 2007
     Achondrite (lunar, mingled basalt-rich breccia)

History: Purchased by Greg Hupé in July 2007 from a dealer in Tagounite, Morocco.
Physical characteristics: A single stone (42 g) partially covered by black fusion crust; interior slices show it to be a breccia composed of white, beige, and light gray clasts in a dark gray matrix (Fig. 3).
Petrography: (A. Irving and S. Kuehner, UWS) Regolithic breccia composed of abundant angular mineral and lithic clasts in a sparse vesicular, glassy matrix. Mineral fragments include calcic plagioclase, pigeonite, augite, Ti chromite, ilmenite (one with a tiny baddeleyite inclusion) and silica polymorph. Lithic clasts include several types of mare basalt (a coarse-grained example is composed of olivine + zoned pigeonite + calcic plagioclase + ilmenite + troilite), granophyric intergrowths of Fe-rich augite + fayalitic olivine + silica polymorph, a coarse-grained dunitic or troctolitic rock containing a large metal grain (associated with rutile and secondary ilmenite), and a large "breccia-within-breccia" clast. Mare basalt clasts and debris are predominant over highlands lithologies.
Geochemistry: Olivine clasts (Fa37.0-37.7; FeO/MnO = 94- 98), olivine in basalt clast (Fa87.9; FeO/MnO = 89), plagioclase (An92.4-95.3Or0.5-0.1), pigeonite host (Fs52.3Wo10.5; FeO/MnO = 65.2), augite lamella (Fs31.9Wo31.9; FeO/MnO = 60.3), pigeonite clast (Fs60.1Wo7.0; FeO/MnO = 71.1), augite clast (Fs17.2Wo36.9; FeO/MnO = 53.3). Bulk composition: (R. Korotev, WUSL) FeO = 13.7 wt%; Sm = 3.1 ppm, Th = 0.9 ppm, Ir = 3.4 ppb.
Classification: Achondrite (lunar, mingled basalt-rich breccia). Specimens: A total of 8.4 g of sample and one polished mount are on deposit at UWS. GHupé holds the main mass.
Submitted by: A. Irving, UWS.

Scientific abstracts and news regarding NWA 4884:

Korotev R. L, Zeigler R. A., Jolliff B. L., Irving A. J., and Bunch T. E.
(2009) Compositional and lithological diversity among brecciated lunar meteorites of intermediate iron composition.
Meteoritics & Planetary Science 44, 1287-1322.
http://epsc.wustl.edu/%7Erlk/papers/korotev_et_al_2009_m&ps_intermediate_iron.pdf

Korotev R. L., Irving A. J., and Bunch T. E.
(2008) Keeping up with the lunar meteorites 2008 (abstract). In
Lunar and Planetary Science XXXIX, abstract no. 1209,
39th Lunar and Planetary Science Conference, Houston.
http://www.lpi.usra.edu/meetings/lpsc2008/pdf/1209.pdf


Complete mass of NWA 4884.
Complete mass of NWA 4884.
  Thin section image in Cross Polarized Light (image measures 7mm wide).
Thin section image in Cross Polarized Light (image measures 7mm wide).

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