Meteoritical Bulletin: Entry for Northwest Africa 11911

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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: 8.9 g

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	Eucrite-pmict
Recommended:			Eucrite-pmict [explanation]

This is 1 of 425 approved meteorites classified as Eucrite-pmict. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 7 Mar 2019

Writeup

help

Writeup from MB 108:

Northwest Africa 11911 (NWA 11911)

Morocco

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 En_39.48Fs_54.7Wo_5.8to En_32.5Fs_47.9Wo_19.6(N=8), High-Ca pyroxene En_30.4Fs_47.3Wo_22.4to En_21.3Fs_35.6Wo_43.0(N=6) Fe/Mn=32 in average. Plagioclase is An_85.8-95.1Ab_4.8-13.9Or_0.07-0.45(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:
  MB108
  Table 0
  Line 0:

Date:	P 2013
Mass (g):	8.9
Pieces:	1
Class:	Eucrite-pmict
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.

Institutions
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)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150

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Geography:

Morocco

Morocco

Coordinates:

Unknown.

Statistics:
This is 1 of 2163 approved meteorites from Morocco (plus 32 unapproved names) (plus 1 impact crater)

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