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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
Classification
  history:
Recommended:  LL3    [explanation]

This is 1 of 371 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
Writeuphelp
Writeup from MB 110:

Northeast Africa 022 (NEA 022)

Libya

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:
  MB110
  Table 0
  Line 0:
Place of purchase:Libya
Date:P 2020 Aug
Mass (g):694
Pieces:1
Class:LL3
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
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, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
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Geography:

Libya
Coordinates:Unknown.

Statistics:
     This is 1 of 1519 approved meteorites from Libya (plus 22 unapproved names) (plus 2 impact craters)

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