Meteoritical Bulletin: Entry for Northwest Africa 11086

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Northwest Africa 11086

Basic information

Name: Northwest Africa 11086
This is an OFFICIAL meteorite name.
Abbreviation: NWA 11086
Observed fall: No
Year found: 2016
Country: Morocco
Mass: 373 g

Classification
history:

Meteoritical Bulletin:	MB 106	(2018)	CM-an
Recommended:			CM-an [explanation]

This is 1 of 10 approved meteorites classified as CM-an. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites

Comments:

Approved 26 Feb 2017

Writeup

help

Writeup from MB 106:

Northwest Africa 11086 (NWA 11086)

Morocco

Find: 2016 May

Classification: Carbonaceous chondrite (CM, anomalous)

History: Reportedly found near Foum Zguid, Morocco.

Physical characteristics: Dark brown stones. Cut surface reveals a lighter brown interior with small chondrules.

Petrography: Well delineated chondrules set in a iron-rich fine grained matrix. Matrix 58 vol%, chondrules and chondrule fragments 42 vol% (from point counting, N=293). Average apparent chondrule diameter 240±120 μm (N=38). Rare metal as ~1 μm spherical inclusions in silicates. X-ray diffraction does not reveal the presence of phyllosilicates.

Geochemistry: Olivine Fa_0.9-32.7, average Fa_14.2±12.2, PMD 81%, FeO/MnO = 79 (N=13), Cr₂O₃ on ferroan olivine 0.36±0.09 wt% (N=10). Orthopyroxene Fs_1.4±0.1Wo_1.1±0.1(N=2). Oxygen isotopic composition (J. Gattacceca, C. Sonzogni, CEREGE) from analysis of one acid-washed 1.5 mg aliquot of a powdered homogenized 475 mg bulk sample is δ¹⁷O=-0.40‰, δ¹⁸O=6.17‰ , Δ¹⁷O=-3.63‰ (linearized, slope 0.5247, analytical uncertainties 0.08‰, 0.12‰, 0.03‰ respectively). Magnetic susceptibility log χ (× 10^-9 m³/kg) = 3.41.

Classification: Carbonaceous chondrite (CM-an). Severe weathering.

Data from:
  MB106
  Table 0
  Line 0:

Place of purchase:	Zagora
Date:	2016 May
Mass (g):	373
Pieces:	several
Class:	CM-an
Weathering grade:	Severe
Fayalite (mol%):	14.2±12.2 (N=13)
Ferrosilite (mol%):	1.4±0.1 (N=2)
Wollastonite (mol%):	1.1±0.1
Magnetic suscept.:	3.41
Classifier:	J. Gattacceca, B. Devouard, CEREGE
Type spec mass (g):	22.64
Type spec location:	CEREGE
Main mass:	Fabien Kuntz and Pierre-Marie Pelé
Comments:	work name K313; submitted by Jérôme Gattacceca

Plots:

O isotopes:

Institutions
and collections

CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 10 Jun 2023)
Kuntz: Fabien Kuntz, France; Website (private address)

Catalogs:

References:

Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.

Find references in NASA ADS:
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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Christophe PICQ
Denis gourgues
Mike Markowitz

Geography:

Morocco

Morocco

Coordinates:

Unknown.

Statistics:
This is 1 of 2082 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater)

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Revision
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