|Northwest Africa 4881|
|Basic information||Name: Northwest Africa 4881|
This is an OFFICIAL meteorite name.
Abbreviation: NWA 4881
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass: 606 g
This is 1 of 62 approved meteorites classified as Lunar. [show all]
Search for other: Lunar meteorites
Approved 1 Jan 2008|
Revised 4 Aug 2008: final writeup
Writeup from MB 93:
Northwest Africa 4881
Mauritania or Algeria
Achondrite (lunar, granulitic breccia)
History: Found in 2005 and purchased by Stefan Ralew in January 2007 from a dealer in Quarzazate, Morocco.
Physical characteristics: A single, broken, irregular conical stone (606 g) partially covered by translucent, pale greenish fusion crust and with a pale gray-brown interior (Fig. 2).
Petrography: (A. Irving and S. Kuehner, UWS) Fine-grained recrystallized breccia composed of larger plagioclase grains (converted partially to maskelynite) poikilitically enclosing very small grains (mostly 30-80 microns) of low-Ca pyroxenes, olivine, Ti-chromite, ilmenite, troilite and metal.
Mineral compositions and Geochemistry: Olivine (Fa40.4-58.8, FeO/MnO = 91-100), plagioclase (An96.1-98Or<0.1), pigeonite (Fs32.0-64.5Wo9.5-13.1, FeO/ MnO = 51.1-62).
Classification: Achondrite (lunar, granulitic breccia). This stone is paired with NWA 3163 (Irving et al. 2006) and NWA 4483; in combination these specimens evidently represent naturally broken pieces from a crusted lunar meteorite weighing at least 2448 g. Specimens: A total of 20 g of sample and one polished mount are on deposit at UWS. Ralew holds the main mass.
Submitted by: A. Irving, UWS.
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address)
|References:||Published in Meteoritical Bulletin, no. 93, MAPS 43, 571-632 (2008)|
This is 1 of 5259 approved meteorites from (Northwest Africa) (plus 2146 unapproved names)
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