Meteoritical Bulletin: Entry for Northeast Africa 023

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Northeast Africa 023

Basic information

Name: Northeast Africa 023
This is an OFFICIAL meteorite name.
Abbreviation: NEA 023
Observed fall: No
Year found: 2020
Country: Libya
Mass: 486 g

Classification
history:

Meteoritical Bulletin:	MB 110	(2022)	LL7
Recommended:			LL7 [explanation]

This is 1 of 100 approved meteorites classified as LL7. [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 25 Apr 2021

Writeup

Writeup from MB 110:

Northeast Africa 023 (NEA 023)

Libya

Purchased: 2020 Apr

Classification: Ordinary chondrite (LL7)

History: Purchased by Mbark Arjdal in April 2020 from a Libyan dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) This fresh specimen has a poikiloblastic texture with abundant very small olivine chadacrysts enclosed by larger low-Ca pyroxene oikocrysts. No recognizable chondrules are present. Accessory phase include sodic plagioclase, augite, taenite, kamacite, troilite and merrillite. Some thin dark shock veinlets are present.

Geochemistry: Olivine (Fa_29.9±0.3, range Fa_29.6-30.3, N = 5), low-Ca pyroxene (Fs_24.2±0.1Wo_3.9±0.2, range Fs_24.1-24.3Wo_3.7-4.2, N = 5), augite (Fs_12.1Wo_40.2).

Classification: Ordinary chondrite (LL7, poikiloblastic).

Specimens: 30.3 g including one polished thin section at UWB; remainder with Mr. M. Arjdal.

Data from:
  MB110
  Table 0
  Line 0:

Place of purchase:	Libya
Date:	P 2020 Apr
Mass (g):	486
Pieces:	1
Class:	LL7
Shock stage:	S2
Weathering grade:	W0/1
Fayalite (mol%):	29.9±0.3
Ferrosilite (mol%):	24.2±0.1
Wollastonite (mol%):	3.9±0.2
Classifier:	A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):	30.3
Type spec location:	UWB
Main mass:	M. Arjdal
Comments:	Work name Arj ZM 605; 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 Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4

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Geography:

Libya

Coordinates:

Unknown.

Statistics:
This is 1 of 1553 approved meteorites from Libya (plus 24 unapproved names) (plus 2 impact craters)

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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