Meteoritical Bulletin: Entry for Northwest Africa 12213

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Northwest Africa 12213

Basic information

Name: Northwest Africa 12213
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12213
Observed fall: No
Year found: 2018
Country: Algeria
Mass: 4.3 kg

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	LL(L)3.2
Recommended:			LL(L)3.2 [explanation]

This is 1 of 2 approved meteorites classified as LL(L)3.2. [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 5 Jan 2019

Writeup

help

Writeup from MB 108:

Northwest Africa 12213 (NWA 12213)

Algeria

Purchased: 2018 May

Classification: Ordinary chondrite (LL(L)3.2)

History: Purportedly found in Algeria and purchased by Ben Hoefnagels in May 2018 from a dealer in Guelmim, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Closely packed, well-formed chondrules (apparent diameter 700±390 µm, N = 20) are set in a finer grained matrix containing altered metal.

Geochemistry: Olivine (Fa_1.2-79.3, Cr₂O₃ in ferroan examples 0.05-0.46 wt.%, mean 0.16±0.10 wt.%, N = 32), orthopyroxene (Fs_2.8-19.9Wo_0.4-1.3, N = 4),pigeonite (Fs_17.8Wo_7.3), subcalcic augite (Fs_4.2Wo_36.4). Magnetic susceptibility log χ (× 10^-9 m³/kg) = 4.57.

Classification: Ordinary chondrite LL(L)3.2. Subtype based on the observed range in Fa content of olivine and the range and mean of Cr₂O₃ contents in ferroan olivines, which are very similar to the results for Krymka (Grossman and Brearley, 2005).

Specimens: 30.5 g including one polished thin section at UWB; remainder with Mr. B. Hoefnagels.

Bibliography:

Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Guelmim
Date:	P 2018 May
Mass (g):	4300
Pieces:	1
Class:	LL(L)3.2
Shock stage:	S2
Weathering grade:	W2
Fayalite (mol%):	1.2-79.3
Ferrosilite (mol%):	2.8-19.9
Wollastonite (mol%):	0.4-1.3
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	30.5
Type spec location:	UWB
Main mass:	B. Hoefnagels
Comments:	Work name BH143; 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)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150

Find references in NASA ADS:
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Geography:

Algeria

Algeria

Coordinates:

Unknown.

Statistics:
This is 1 of 1059 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)

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