Meteoritical Bulletin: Entry for Northwest Africa 13180

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Northwest Africa 13180

Basic information

Name: Northwest Africa 13180
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13180
Observed fall: No
Year found: 2019
Country: Algeria
Mass: 945 g

Classification
history:

Recommended:

L4 [explanation]

This is 1 of 1709 approved meteorites (plus 4 unapproved names) classified as L4. [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 9 Feb 2020

Writeup

Writeup from MB 109:

Northwest Africa 13180 (NWA 13180)

Algeria

Purchased: 2019 Jun

Classification: Ordinary chondrite (L4)

History: Purchased by Mbark Arjdal in June 2019 from an Algerian dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Well-formed chondrules are set in a recrystallized matrix containing altered kamacite, taenite, chromite and troilite.

Geochemistry: Olivine (Fa_24.7±0.1, range Fa_24.6-24.9, N = 7), low-Ca pyroxene (Fs_20.8±0.2Wo_1.6±0.2, range Fs_20.6-21.0Wo_1.4-1.9, N = 5), augite (Fs_8.2±1.2Wo_44.7±1.0, range Fs_7.1-9.5Wo_45.8-44.1, N = 3).

Classification: Ordinary chondrite (L4).

Specimens: 47.8 g including two polished thin sections at UWB; remainder with Mr. M. Arjdal.

Data from:
  MB109
  Table 0
  Line 0:

Place of purchase:	Algeria
Date:	P 2019 Jun
Mass (g):	945
Pieces:	2
Class:	L4
Shock stage:	S2
Weathering grade:	W2
Fayalite (mol%):	24.7±0.1
Ferrosilite (mol%):	20.8±0.2
Wollastonite (mol%):	1.6±0.2
Classifier:	A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):	47.8
Type spec location:	UWB
Main mass:	M. Arjdal
Comments:	Work names Arj ZM 76 and ZM 185; 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, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 109, in preparation (2020)

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Geography:

Algeria

Coordinates:

Unknown.

Statistics:
This is 1 of 1073 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)

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