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Northwest Africa 10783
Basic information Name: Northwest Africa 10783
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10783
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 22 g
Meteoritical Bulletin:  MB 105  (2016)  Lunar (anorth)
Recommended:  Lunar (anorth)    [explanation]

This is 1 of 83 approved meteorites classified as Lunar (anorth).   [show all]
Search for other: Lunar meteorites
Comments: Approved 2 Nov 2016
Writeup from MB 105:

Northwest Africa 10783 (NWA 10783)

(Northwest Africa)

Purchased: 2015 May 1

Classification: Lunar meteorite (anorth)

History: Found in the Almahbas region near the frontier between Morocco and Algeria.

Physical characteristics: The stone is a breccia with no visible fusion crust. The type specimen is mostly light colored with metal specks, and there is a dark zone at one end.

Petrography: (R. Hewins, S. Pont, B. Zanda, MNHNP) Most of the prepared section is a poikilitic anorthosite resembling Apollo 77017. It consists of plagioclase phenocrysts up to 2 mm in length set in pyroxene poikilitic to stubby tiny plagioclase laths (down to 20 μm) and to olivine granules (~50 μm). Both pigeonite and augite are present, but with no obvious exsolution. Minor minerals include chromite, ilmenite, baddeleyite, taenite and kamacite. There is a dark sliver of breccia matrix at the end of the section containing a huge variety of clast types, 1 mm or smaller. These include crystal clasts (olivine, pigeonite, augite, anorthite, chromite and a silica polymorph), breccia clasts, and lithic clasts often with elongated plagioclase laths.

Geochemistry: Mineral compositions and Geochemistry: (R. Hewins and S. Pont, MNHNP) The olivine composition is Fa34.1±1.5, with FeO/MnO 119±14. Pyroxenes are pigeonite Fs25.4Wo11.1 and augite En49.6Fs19.2Wo31.2. Plagioclase is An94.0±0.6Ab5.5±0.6Or0.5±0.2. Taenite contains ~37% Ni. Mineral compositions are similar to those of Apollo 77017, but olivine is a little less ferroan.

Classification: (R. Hewins MNHN, L. Labenne Paris) Lunar poikilitic anorthositic breccia.

Specimens: The type specimen consists of 3.78 g and 0.63 g at MNHNP. The remaining 17.6 g minus sawdust has been sold in the form of thin slices by Labenne.

Data from:
  Table 0
  Line 0:
Place of purchase:Agadir
Date:P 2015 May 1
Mass (g):22.0
Class:Lunar (anorth)
Weathering grade:low
Classifier:R. Hewin,s MNHNP
Type spec mass (g):4.41
Type spec location:MNHNP
Main mass:Labenne Meteorites
Comments:X: Temporary name LM 220515 X.; submitted by R. Hewins
   and collections
MNHNP: Museum National d'Histoire Naturelle, IMPMC-CP52, 57 rue Cuvier, 75005 Paris, France, France; Website (institutional address)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)
MNHN: Museum National d'Histoire Naturelle, IMPMC-CP52, 57 rue Cuvier, 75005 Paris, France, France; Website (institutional address)
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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     This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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