Meteoritical Bulletin: Entry for Northwest Africa 11254

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Northwest Africa 11254

Basic information

Name: Northwest Africa 11254
This is an OFFICIAL meteorite name.
Abbreviation: NWA 11254
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass: 18 g

Classification
history:

Meteoritical Bulletin:	MB 107	(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 27 Mar 2018

Writeup

help

Writeup from MB 107:

Northwest Africa 11254 (NWA 11254)

(Northwest Africa)

Purchased: 2016 Oct

Classification: Carbonaceous chondrite (CM, anomalous)

History: Purchased by Dustin Dickens in October 2016 from a dealer in Laayoune, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS ; L. Garvie, ASU) Very small chondrules (apparent diameter 200±100 µm), mineral fragments and some very fine grained CAI are set in an extremely fine grained matrix (~30 vol.%, black in thin section) containing pyrrhotite, kamacite, and taenite. No phyllosilicates were detected by X-ray diffraction.

Geochemistry: Olivine (Fa_0.8-58.6, N = 3), orthopyroxene (Fs_1.8-3.1Wo_1.1-0.4, N = 3), clinopyroxene (Fs_1.5-2.0Wo_45.3-42.6, N = 2). Oxygen isotopes (Karen Ziegler, UNM) of acid-washed subsamples: δ¹⁷O 0.241, -0.423; δ¹⁸O 9.268, 8.823; Δ¹⁷O -4.653, -5.082 (all per mil).

Classification: Carbonaceous chondrite (CM-an). The anomalous character comes from the absence of phyllosilicates, and the oxygen isotopes that plot below the trend for CM chondrites.

Specimens: 3.6 g including one polished thin section at UWB; remainder with Mr. D. Dickens.

Data from:
  MB107
  Table 0
  Line 0:

Place of purchase:	Laayoune
Date:	P 2016 Oct
Mass (g):	18
Pieces:	1
Class:	CM-an
Shock stage:	S2
Weathering grade:	low
Fayalite (mol%):	0.8-58.6
Ferrosilite (mol%):	1.8-3.1
Wollastonite (mol%):	1.1-0.4
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	3.6
Type spec location:	UWB
Main mass:	D. Dickens
Comments:	Work name DD17-6; submitted by A. Irving

Plots:

O isotopes:

Institutions
and collections

ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462

Find references in NASA ADS:
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Photos:

Credit	Photos
Public domain photographs:
A. Irving

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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Revision
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