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Northwest Africa 11911
Basic information Name: Northwest Africa 11911
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11911
Observed fall: No
Year found: 2013
Country: Morocco
Mass:help 8.9 g
Meteoritical Bulletin:  MB 108  (2020)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 414 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 7 Mar 2019
Writeup from MB 108:

Northwest Africa 11911 (NWA 11911)


Purchased: 2013

Classification: HED achondrite (Eucrite, polymict)

Physical characteristics: (T. Shisseh, FSAC) One brecciated stone with white and black interior. A black inclusion, clasts and rock fragments are visible to the naked eye.

Petrography: (T. Shisseh, FSAC; S. Pont, MNHNP) Breccia with basaltic clasts, impact melt clasts, rock fragments embedded in a clastic matrix. The main minerals are plagioclase, pyroxene and minor silica, with chromite, ilmenite and Fe-metal. The black inclusion is an impact melt measuring 2 × 5 mm. Plagioclase and pyroxene in the clastic matrix are up to 1 mm, some pyroxene grains are unequilibrated. Basaltic clasts up to 0.6 mm with ophitic to sub-ophitic plagioclase laths and pyroxene. Shock veins with entrained rounded plagioclase, pyroxene and silica. Faulting surface up to 2 mm.

Geochemistry: Mineral compositions and geochemistry: (T. Shisseh, FSAC; R. Hewins, B. Zanda, MNHNP) Low-Ca pyroxene En39.48Fs54.7Wo5.8 to En32.5Fs47.9Wo19.6 (N=8), High-Ca pyroxene En30.4Fs47.3Wo22.4 to En21.3Fs35.6Wo43.0 (N=6) Fe/Mn=32 in average. Plagioclase is An85.8-95.1Ab4.8-13.9Or0.07-0.45 (N=4).

Classification: (T. Shisseh, FSAC; R. Hewins, MNHNP) Polymict eucrite breccia. The meteorite contains anorthite, and pyroxene with Fe/Mn ratios matching eucrite, plus typical eucrite textures.

Data from:
  Table 0
  Line 0:
Date:P 2013
Mass (g):8.9
Ferrosilite (mol%):42.1±9.3 (23.1-54.9, N=14).
Wollastonite (mol%):19.6±13.6 (5.8-43.1).
Classifier:T. Shisseh, FSAC; R. Hewins, B. Zanda, MNHNP
Type spec mass (g):1.8
Type spec location:MNHNP
Main mass:Luc Labenne meteorites
Comments:Submitted by T. Shisseh. Temporary name LM130115O; submitted by T. Shisseh.
   and collections
MNHNP: Museum National d'Histoire Naturelle, IMPMC-CP52, 57 rue Cuvier, 75005 Paris, France, France; Website (institutional address)
FSAC: Universite Hassan II Casablanca, Faculte des Sciences Ain Chock, Departement de Géologie, BP 5366 Maârif, Casablanca, Morocco (institutional address; updated 9 Jan 2013)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 2089 approved meteorites from Morocco (plus 32 unapproved names) (plus 1 impact crater)

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