Meteoritical Bulletin: Entry for Northwest Africa 13178

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Northwest Africa 13178

Basic information

Name: Northwest Africa 13178
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13178
Observed fall: No
Year found: 2019
Country: Mali
Mass: 1876 g

Classification
history:

Meteoritical Bulletin:	MB 109	(2020)	CO3
Recommended:			CO3 [explanation]

This is 1 of 645 approved meteorites (plus 1 unapproved name) classified as CO3. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites

Comments:

Approved 29 Feb 2020

Writeup

Writeup from MB 109:

Northwest Africa 13178 (NWA 13178)

Mali

Purchased: 2019 Aug

Classification: Carbonaceous chondrite (CO3)

History: Purchased by Mbark Arjdal in August 2019 from a dealer in Nouakchott, Mauritania.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Fairly closely packed, small well-formed chondrules (apparent diameter 220±130 µm, N = 23), very fine-grained CAI and mineral fragments are set in a fine-grained matrix (~15 vol.%, orange-brown in thin section).

Geochemistry: Olivine (Fa_30.5±16.1, range Fa_1.2-56.8, N = 14; Cr₂O₃ in ferroan examples 0.03-0.61 wt.%, mean 0.13±0.16 wt.%, N = 11), low-Ca pyroxene (Fs_2.0±1.8Wo_2.5±1.5, range Fs_0.8-5.0Wo_0.9-4.1, N = 5), pigeonite (Fs_10.7Wo_4.5), diopside (Fs_1.1Wo_43.8).

Classification: Carbonaceous chondrite (CO3).

Specimens: 27.6 g including one polished thin section at UWB; remainder with Mr. M. Arjdal.

Data from:
  MB109
  Table 0
  Line 0:

Place of purchase:	Nouakchott, Mauritania
Date:	P 2019 Aug
Mass (g):	1876
Pieces:	many
Class:	CO3
Shock stage:	S2
Weathering grade:	low
Fayalite (mol%):	30.5±16.1
Ferrosilite (mol%):	2.0±1.8
Wollastonite (mol%):	2.5±1.5
Classifier:	A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):	27.6
Type spec location:	UWB
Main mass:	M. Arjdal
Comments:	Work name Arj ZM 1; submitted by A. Irving

Institutions
and collections

UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
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. 109, in preparation (2020)

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Geography:

Mali

Coordinates:

Unknown.

Statistics:
This is 1 of 116 approved meteorites from Mali (plus 2 unapproved names)

Also see:

This lists the most popular meteorites among people who looked up this meteorite.

Revision
history:

This lists important revisions made to data for this record.

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