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Northwest Africa 2727
Basic information Name: Northwest Africa 2727
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 2727
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 191.2 g
Classification
  history:
Meteoritical Bulletin:  MB 90  (2006)  Lunar (mare basalt/gabbro breccia)
Recommended:  Lunar (bas/gab brec)    [explanation]

This is the only approved meteorite classified as Lunar (bas/gab brec).
Search for other: Lunar meteorites
Comments: Approved 16 Jan 2006
Revised 3 Feb 2006: Revised writeup
Writeuphelp
Writeup from MB 90:

Northwest Africa 2727

Morocco or Algeria

Find: June/July 2005

Achondrite (lunar, mare basalt/gabbro breccia)

History: Four stones of 30.6 g, 11.6 g, 64 g, and 85 g were purchased from Moroccan dealers in Erfoud for a consortium of North American collectors in June and July of 2005.

Petrography and Geochemistry: (T. Bunch and J. Wittke, NAU; A. Irving and S. Kuehner, UWS; R. Korotev, WUSL) All stones are very similar and consist of clast-dominated polymict breccias composed of >80 vol% olivine-phyric basalt and gabbroic/diabasic clasts (0.2 cm to several cm across) within a finer breccia matrix. The basalt clasts show a wide range in mineral compositions, but all contain phenocrysts of olivine (Fa28–99; FeO/MnO = 98.9) and some also have phenocrysts of pyroxferroite or chromite all in a fine-grained matrix consisting of intergrown pigeonite, pyroxferroite, K-Ba feldspar, ilmenite, merrillite, baddeleyite, troilite, silica, and glass. The gabbroic clasts range in texture from coarser-grained (>3 mm) hypidiomorphic gabbro to finer-grained (~1 mm) diabasic clasts. Both types of gabbroic lithologies consist mainly of pigeonite (Fs23.3–31.3Wo8.7–11.5; FeO/MnO = 60–69) and subhedral to anhedral olivine (Fa34.1–41; FeO/MnO = 85– 99) with less abundant augite (Fs24.1–47.5Wo24.4–32.1) and partly maskelynite, blocky to tabular plagioclase (An81–94). The breccia matrix consists mainly of gabbroic debris with fragments of basalt, silica polymorph, symplectites, subparallel intergrowths of anorthite + pyroxferroite + ilmenite and shock-melted material. Bulk compositions: (R. Korotev, WUSL) INAA of 11 subsamples show that they vary considerably in bulk composition, with the most Fe-rich subsample nearly indistinguishable from NWA 3160 basalt. All other subsamples are compositionally equivalent to mixtures of NWA 3160 basalt and the regolith breccia lithology of NWA 773, but with slightly lower concentrations of incompatible elements. Note: Based on petrography, mineral compositions, and bulk compositions, these stones are paired with NWA 3160 and may be paired with NWA 773.

Classification: Achondrite (lunar, mare basalt/gabbro breccia).

Specimens: A 20.2 g type specimen and two polished thin sections are on deposit at NAU. A 0.5 g type specimen is on deposit at WUSL. Oakes, Reed, Boswell, and Turecki hold the main masses.

Data from:
  MB90
  Table 2
  Line 69:
Place of purchase:Erfoud, Morocco
Date:2005
Mass (g):191.2
Pieces:4
Class:Lunar
Type spec mass (g):20.2
Institutions
   and collections
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
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)
Oakes: Nelson Oakes, Route 1, House 50C, Uniondale, PA 18470, United States; Website (private address)
Reed: Blaine Reed, P.O. Box 1141, Delta, CO 81416, United States; Website (private address)
Turecki: Stan Turecki, 5618 Regis Ave., Port Richey, Florida, United States (private address; updated 28 Dec 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 90, MAPS 41, 1383-1418 (2006)
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Peter Marmet   
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Jay Piatek   
t.czarnecki   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7005 approved meteorites from (Northwest Africa) (plus 2002 unapproved names)

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