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Northwest Africa 4485
Basic information Name: Northwest Africa 4485
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4485
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass:help 188 g
Meteoritical Bulletin:  MB 91  (2007)  Lunar (KREEP-rich breccia)
Recommended:  Lunar    [explanation]

This is 1 of 101 approved meteorites classified as Lunar.   [show all]
Search for other: Lunar meteorites
Comments: Approved 28 Mar 2007
Writeup from MB 91:

Northwest Africa 4485


Find: September 2006

Achondrite (lunar, KREEP-rich breccia)

History: Stefan Ralew purchased the whole stone in September 2006 from a dealer in Ouarzazate, Morocco.
Physical characteristics: A single 188 g spheroidal stone with a brown weathered exterior. The interior consists of pale gray to whitish clasts in a dark gray matrix, and has visible thin veins of terrestrial carbonate.

Petrography: (A. Irving and S. Kuehner, UWS) Lithic clasts (up to 0.5 cm) are predominantly various types of ophitic to quench-textured basalts (composed of pyroxene(s), plagioclase, olivine, ilmenite, and rare baddeleyite). Granophyre clasts (consisting of subparallel to symplectitic intergrowths of silica and K-feldspar with accessory baddeleyite) are present as a minor component, as well as very fine-grained, quench-textured clasts composed of glass and fine plagioclase microlites. Mineral clasts include pyroxenes, olivine, plagioclase, silica, zircon, baddeleyite, merrillite, Ti-chromite, fayalite, ilmenite, metal (both kamacite and taenite), and troilite (Kuehner et al. 2007).

Mineral compositions and geochemistry: Olivine (Fa26.3–63.6; FeO/MnO = 99–121), plagioclase (An88.9–89.7Or0.3–0.6), orthopyroxene (Fs18.9–19.7Wo4.6–3.7; FeO/MnO = 87–89), pigeonite (Fs37.0Wo10.1; FeO/MnO = 62), subcalcic augite (Fs48.9–49.2Wo26.7–39, FeO/MnO = 59–67), fayalite (Fa90.1, FeO/MnO = 80). Bulk composition: (R. Korotev, WUSL) INAA on eight ~30 mg subsamples gave a mean composition of: Na = 0.441, Fe = 7.27 (both wt%), Sc = 21.7, La = 31.6, Sm = 14.12, Eu = 1.46, Yb = 11.0, Zr = 443, Hf = 11.4, Ba = 375, Th = 6.37 (all ppm). Although it is possible that there is a minor mare basalt component, this specimen is dominated by materials with KREEP-like compositions, and is essentially identical in bulk composition and petrologic characteristics to Northwest Africa 4472.

Classification: Achondrite (lunar, KREEP-rich breccia).

Type specimen: A total of 20 g and one polished mount are on deposit at UWS. Ralew holds the main mass.

Data from:
  Table 2
  Line 344:
Place of purchase:Quarzazate, Morocco
Date:2006 Sep
Mass (g):188
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20
Type spec location:UWS
Main mass:Ralew
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
Ralew: Stefan Ralew, Kunibertstra├če 29, 12524 Berlin, Germany; Website (private address)
References: Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)
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Photos from the Encyclopedia of Meteorites:
Martin Altmann      
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Doug R   
Gregor H.   

     This is 1 of 8890 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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