Meteoritical Bulletin: Entry for Northwest Africa 13473

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Northwest Africa 13473

Basic information

Name: Northwest Africa 13473
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13473
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass: 84 g

Classification
history:

Meteoritical Bulletin:	MB 109	(2020)	H4
Recommended:			H4 [explanation]

This is 1 of 6493 approved meteorites (plus 2 unapproved names) classified as H4. [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 2 Nov 2020

Writeup

Writeup from MB 109:

Northwest Africa 13473 (NWA 13473)

(Northwest Africa)

Purchased: 2018 Dec

Classification: Ordinary chondrite (H4)

History: Purchased by Mbark Arjdal in December 2018 from a delaer in Timbuktu, Mali.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Well-formed, relatively small equilibrated chondrules are set in a relatively coarse grained, recrystallized matrix containing kamacite (extensively altered to Fe hydroxides), merrillite and troilite (partially altered).

Geochemistry: Olivine (Fa_19.0±0.2, range Fa_18.7-19.1, N = 5), low-Ca pyroxene (Fs_16.6±0.2Wo_1.6±1.3, range Fs_16.4-16.6Wo_1.0-3.9, N = 5), clinopyroxene (Fs_7.8±0.6Wo_37.8±2.6, range Fs_7.3-8.5Wo_35.2-40.3, N = 3).

Classification: Ordinary chondrite (H4).

Specimens: 17.5 g including one polished thin section at UWB; remainder with Mr. M. Arjdal.

Data from:
  MB109
  Table 0
  Line 0:

Place of purchase:	Timbuktu, Mali
Date:	P 2018 Dec
Mass (g):	84
Pieces:	1
Class:	H4
Shock stage:	S2
Weathering grade:	W3
Fayalite (mol%):	19.0±0.2
Ferrosilite (mol%):	16.6±0.2
Wollastonite (mol%):	1.6±1.3
Classifier:	A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):	17.5
Type spec location:	UWB
Main mass:	M. Arjdal
Comments:	Arj ZM137; 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:

Coordinates:

Unknown.

Statistics:
This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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