Meteoritical Bulletin: Entry for Northwest Africa 12641

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Northwest Africa 12641

Basic information

Name: Northwest Africa 12641
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12641
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass: 613 g

Classification
history:

Recommended:

CK4 [explanation]

This is 1 of 130 approved meteorites classified as CK4. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites

Comments:

Approved 30 Sep 2024

Writeup

Writeup from MB 113:

Northwest Africa 12641 (NWA 12641)

(Northwest Africa)

Purchased: 2018 Oct

Classification: Carbonaceous chondrite (CK4)

History: Purchased in Temara, Morocco, by Adam Aaronson in October 2018.

Petrography: (A. Irving and S. Kuehner, UWS) Separated, well-defined, Cr-magnetite-bearing chondrules (apparent diameter 760±270 µm, N = 25) occur in a relatively coarse-grained matrix containing magnetite (partially altered to secondary Fe hydroxides, khaki brown in thin section) and sparse small, fine-grained CAI.

Geochemistry: Olivine (Fa_24.9±0.3(range Fa_24.6-25.2), N = 2), low-Ca pyroxene (Fs_21.8±5.5Wo_0.9±0.6(range Fs_13.9-26.4Wo_1.7-0.4), N = 4), Al₂O₃ = 1.0-4.0 wt.%), subcalcic augite (Fs_13.3Wo_28.3), augite (Fs_8.6Wo_45.7).

Classification: Carbonaceous chondrite (CK4).

Specimens: 25 g including one polished thin section at UWB; remainder with Aaronson.

Data from:
  MB113
  Table 0
  Line 0:

Place of purchase:	Temara
Date:	P 2018 Oct
Mass (g):	613
Pieces:	1
Class:	CK4
Shock stage:	low
Weathering grade:	moderate
Fayalite (mol%):	24.9±0.3
Ferrosilite (mol%):	21.8±5.5
Wollastonite (mol%):	0.9±0.6
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	25
Type spec location:	UWB
Main mass:	A. Aaronson
Comments:	Work name M2127; 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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 113, in preparation (2024)

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9933 approved meteorites from (Northwest Africa) (plus 1837 unapproved names)

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