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Northwest Africa 4472
Basic information Name: Northwest Africa 4472
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4472
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass:help 64.3 g
Classification
  history:
Meteoritical Bulletin:  MB 91  (2007)  Lunar (KREEP-rich breccia)
Recommended:  Lunar    [explanation]

This is 1 of 89 approved meteorites classified as Lunar.   [show all]
Search for other: Lunar meteorites
Comments: Approved 28 Mar 2007
Writeuphelp
Writeup from MB 91:

Northwest Africa 4472

Algeria

Find: July 2006

Achondrite (lunar, KREEP-rich breccia)

History: G. Hupé purchased the sample July 2006 from a dealer in Tagounite, Morocco.

Physical characteristics: A single 64.3 g stone with visible pale gray to whitish clasts in a dark gray matrix. Fusion crust is not evident, but the exterior has fractures and thin coatings of desert varnish on exposed surfaces.

Petrography: (A. Irving and S. Kuehner, UWS) Lithic clasts (up to 0.65 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 “ribbon-like” subparallel intergrowths of silica and K-feldspar with accessory baddeleyite and rare tranquillityite) are present as a minor component, as well as clasts composed mainly of fayalite (with associated glass, silica, K-feldspar, and merrillite) and spherical to ellipsoidal glass objects (up to 60 µm across). Mineral clasts include pyroxenes, olivine, plagioclase, silica, zircon, baddeleyite, merrillite, Ti-chromite, fayalite, ilmenite (with baddeleyite inclusions), metal (both kamacite and taenite), troilite, and schreibersite (Kuehner et al. 2007).

Mineral compositions and geochemistry: Olivine (Fa56.6–64.6; FeO/MnO = 91–101), plagioclase (An86.9–97.5 Or0.2–0.6), orthopyroxene (Fs26.9–29.3Wo3.8–4.1; FeO/MnO = 51–62), subcalcic augite (Fs52.6Wo30.5; FeO/MnO = 72), Al-Cr-rich pigeonite (Fs27.0Wo17.1; FeO/MnO = 51.1, Al = 3.10 wt%, Cr = 1.01 wt%), fayalite (Fa90.3; FeO/MnO = 92), barian K-feldspar intergrown with silica (Or80.9–55.6Ab15.3–30.2 Cn0.6–6.3). Bulk composition: (R. Korotev, WUSL) INAA on nine ~30 mg subsamples gave a mean composition of: Na = 0.448, Fe = 7.14 (both wt%), Sc = 20.9, La = 44.7, Sm = 19.51, Eu = 1.50, Yb = 13.4, Zr = 438, Hf = 11.1, Ba = 601, Th = 7.49 (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 12.87 g and 3 polished thick slices are on deposit at UWS. G. Hupé holds the main mass.

Data from:
  MB91
  Table 2
  Line 341:
Place of purchase:Tagounite, Morocco
Date:2006 Jul
Mass (g):64.3
Pieces:1
Class:Lunar
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):12.87
Type spec location:UWS
Main mass:G. Hupé
Institutions
   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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
The Hupe Collection      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7385 approved meteorites from (Northwest Africa) (plus 1955 unapproved names)

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