Meteoritical Bulletin: Entry for Northwest Africa 13475

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Northwest Africa 13475

Basic information

Name: Northwest Africa 13475
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13475
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass: 8.44 kg

Classification
history:

Meteoritical Bulletin:	MB 109	(2020)	L5-melt breccia
Recommended:			L5-melt breccia [explanation]

This is 1 of 42 approved meteorites classified as L5-melt breccia. [show all]
Search for other: L chondrites, L chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 11 Nov 2020

Writeup

help

Writeup from MB 109:

Northwest Africa 13475 (NWA 13475)

(Northwest Africa)

Purchased: 2019 May

Classification: Ordinary chondrite (L5, melt breccia)

History: Purchased by John Higgins in May 2019 from a Mauritanian dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia consisting of equilibrated Type 5 clasts (largely recrystallized with sparse chondrules) set in a sparse fine grained matrix (~10 vol.%), portions of which exhibit melt textures (notably tiny sulfide-metal composite spherules). Accessory phases include albitic plagioclase, troilite, kamacite, taenite, low-Ti chromite and merrillite.

Geochemistry: Olivine (Fa_24.7±0.5, range Fa_23.9-25.2, N = 5), low-Ca pyroxene (Fs_21.1±0.21Wo_1.5±0.3, range Fs_21.0-21.3Wo_1.0-1.7, N = 5), clinopyroxene (Fs_8.8±2.3Wo_44.3±1.6, range Fs_6.9-8.2Wo_44.5-45.8, N = 2).

Classification: Ordinary chondrite (L5 melt breccia).

Specimens: 164 g including one polished thin section at UWB; remainder with Mr.J. Higgins.

Data from:
  MB109
  Table 0
  Line 0:

Place of purchase:	Mauritania
Date:	P 2019 May
Mass (g):	8438
Pieces:	5
Class:	L5-melt breccia
Shock stage:	S2 clast
Weathering grade:	W1
Fayalite (mol%):	24.7±0.5
Ferrosilite (mol%):	21.1±0.1
Wollastonite (mol%):	1.5±0.3
Classifier:	A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):	164
Type spec location:	UWB
Main mass:	J. Higgins
Comments:	JH20-6; 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)

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)
Kenneth Alvarez Castillo

Geography:

Coordinates:

Unknown.

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