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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:help 486 g
Recommended:  LL7    [explanation]

This is 1 of 93 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 from MB 110:

Northeast Africa 023 (NEA 023)


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 (Fa29.9±0.3, range Fa29.6-30.3, N = 5), low-Ca pyroxene (Fs24.2±0.1Wo3.9±0.2, range Fs24.1-24.3Wo3.7-4.2, N = 5), augite (Fs12.1Wo40.2).

Classification: Ordinary chondrite (LL7, poikiloblastic).

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

Data from:
  Table 0
  Line 0:
Place of purchase:Libya
Date:P 2020 Apr
Mass (g):486
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
   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)
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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     This is 1 of 1538 approved meteorites from Libya (plus 23 unapproved names) (plus 2 impact craters)

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