Meteoritical Bulletin: Entry for Northwest Africa 12538

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Northwest Africa 12538

Basic information

Name: Northwest Africa 12538
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12538
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass: 412 g

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	LL3
Recommended:			LL3 [explanation]

This is 1 of 365 approved meteorites classified as LL3. [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 12 Mar 2019

Writeup

Writeup from MB 108:

Northwest Africa 12538 (NWA 12538)

(Northwest Africa)

Purchased: 2018 Nov

Classification: Ordinary chondrite (LL3)

History: Purchased by Ben Hoefnagels in November 2018 from a dealer in Agadir, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Well-formed, closely packed chondrules (apparent diameter 740±410 µm, N = 23) are set in a fine grained matrix containing stained metal.

Geochemistry: Olivine (Fa_33.1±20.6(1.7-59.4), Cr₂O₃ in ferroan examples 0.05-0.10 wt.%, mean 0.08±0.02 wt.%, N = 7), low-Ca pyroxene (Fs_10.7±8.1(2.0-18.1)Wo_1.2±1.1(0.2-2.4), N = 3), pigeonite (Fs_16.9Wo_17.5), diopside (Fs_2.7Wo_47.1). Magnetic susceptibility log χ (× 10^-9 m³/kg) = 3.54.

Classification: Ordinary chondrite (LL3).

Specimens: 20.4 g including one polished thin section at UWB; remainder with Mr. B. Hoefnagels.

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Agadir
Date:	P 2018 Nov
Mass (g):	411.5
Pieces:	2
Class:	LL3
Shock stage:	S2
Weathering grade:	W1/2
Fayalite (mol%):	1.7-59.4
Ferrosilite (mol%):	2.0-18.1
Wollastonite (mol%):	0.2-2.4
Magnetic suscept.:	3.54
Classifier:	A. Irving & S. Kuehner
Type spec mass (g):	20.4
Type spec location:	UWB
Main mass:	B. Hoefnagels
Comments:	Work name BH179; 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

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 7655 approved meteorites from (Northwest Africa) (plus 1972 unapproved names)

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