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Northwest Africa 6355
Basic information Name: Northwest Africa 6355
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6355
Observed fall: No
Year found: 2010
Country: Morocco
Mass:help 760 g
Classification
  history:
Meteoritical Bulletin:  MB 99  (2012)  Lunar (feld. brec.)
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 44 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 15 Apr 2011
Writeuphelp
Writeup from MB 99:

Northwest Africa 6355 (NWA 6355)

Morocco

Found: June 2009

Classification: Lunar meteorite (feldspathic breccia)

History: Found in southern Morocco in June 2009 and purchased by a consortium led by Matt Morgan from a Moroccan dealer in September 2010.

Physical characteristics: A single fine-grained, brittle stone (760 g) with no obvious fusion crust. The interior is dark gray and resembles devitrified glass with dispersed small white clasts.

Petrography: Clast-laden vitric breccia consisting of fine-grained mineral debris (mostly pyroxenes, olivine and anorthite) and sparse polycrystalline igneous clasts in a heterogeneous, "swirly" glassy matrix (in part vesicular). Mineral clasts include anorthitic plagioclase, low-Ca pyroxene, pigeonite, olivine, Mg-bearing ilmenite, kamacitic metal and troilite. Lithic clasts include microgabbronorite (composed of subcalcic augite, orthopyroxene, anorthite, Mg-bearing merrillite, silica polymorph, ilmenite, troilite and baddeleyite).

Geochemistry: Low-Ca pyroxene (Fs37.5-61.2Wo2.4-5.2, FeO/MnO = 65-88), pigeonite (Fs23.5-45.5Wo10.3-11.1, FeO/MnO = 48-76), subcalcic augite (Fs13.0Wo37.0, Fs17.6Wo30.1, Fs25.7Wo35.0, FeO/MnO = 55-59), augite (Fs11.3Wo41.8; FeO/MnO = 49), olivine (Fa29.5-33.9, FeO/MnO = 81-104), plagioclase (An91.6-96.1Or0.5-0.1). Bulk composition (R. Korotev, WUSL): FeO 5.8 wt%, La 13.0 ppm, Sm 6.1 ppm, Yb 3.95 ppm, Th 1.87 ppm.

Classification: Achondrite (lunar, feldspathic breccia). This stone is almost identical in texture, mineral compositions and bulk composition to NWA 4936, NWA 5406 and NWA 6221. It is possibly paired with those stones and is reportedly from the same find location.

Specimens: A total of 20.1 g of sample and one polished thin section are on deposit at UWS. The main mass is held jointly by Morgan, Abraham, Rose, Curtiss and an anonymous collector.

Data from:
  MB99
  Table 0
  Line 0:
Place of purchase:Morocco
Date:June 2009
Mass (g):760
Pieces:1
Class:Lunar (feldsp. breccia)
Shock stage:low
Weathering grade:low
Fayalite (mol%):29.5-33.9
Ferrosilite (mol%):37.5-61.2; 23.5-45.5; 17.6; 11.3
Wollastonite (mol%):2.4-5.2; 10.3-11.1; 30.1; 41.8
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.1
Type spec location:UWS
Main mass:Morgan
Comments:Submitted by A. Irving
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. 99, April 2012, MAPS 47, E1-E52 (2012) [published online only]
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
AurĂ©lien Rombaut   
Chris Handler   
Michael S. Scherman   
Volker Heinrich   
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 953 approved meteorites from Morocco (plus 8 unapproved names)

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