MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 3 Jun 2023
Search for: Search type: Search limits: Display: Publication:
Text help
Starts with
Sounds like
Falls  Non-NWAs
What's new
  in the last:
Include past classifications in search
Limit to approved meteorite names
Search text:  
Northeast Africa 022
Basic information Name: Northeast Africa 022
     This is an OFFICIAL meteorite name.
Abbreviation: NEA 022
Observed fall: No
Year found: 2020
Country: Libya
Mass:help 694 g
Recommended:  LL3    [explanation]

This is 1 of 452 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 10 Apr 2021
Writeup from MB 110:

Northeast Africa 022 (NEA 022)


Purchased: 2020 Aug

Classification: Ordinary chondrite (LL3)

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

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Well-formed, very closely-packed glass-bearing chondrules (apparent diameter 890 ± 230 µm, N = 25) are accompanied by very sparse fine grained matrix containing kamacite, taenite, troilite, low-Ti chromite and merrillite.

Geochemistry: Olivine (Fa22.6±8.6, range Fa1.1-29.0, N = 10; Cr2O3 in ferroan olivine <0.05 wt.%), low-Ca pyroxene (Fs25.5±4.7Wo1.2±0.9, range Fs21.5-30.7Wo0.4-2.1, N = 3), pigeonite (Fs37.1Wo7.3), augite (Fs7.1Wo39.4; Fs4.6Wo45.5; N = 2). Magnetic susceptibility log χ (× 10-9 m3/kg) = 4.39.

Classification: Ordinary chondrite (LL3).

Specimens: 66.3 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 Aug
Mass (g):694
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):22.6±8.6
Ferrosilite (mol%):25.5±4.7
Wollastonite (mol%):1.2±0.9
Magnetic suscept.:4.39
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):66.3
Type spec location:UWB
Main mass:M. Arjdal
Comments:Work name Arj ZM 599; 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
Find references in NASA ADS:
Find references in Google Scholar:


     This is 1 of 1538 approved meteorites from Libya (plus 23 unapproved names) (plus 2 impact craters)

Direct link to this page