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Northeast Africa 031
Basic information Name: Northeast Africa 031
     This is an OFFICIAL meteorite name.
Abbreviation: NEA 031
Observed fall: No
Year found: 2019
Country: Libya
Mass:help 260 g
Classification
  history:
Meteoritical Bulletin:  MB 110  (2022)  L4
Recommended:  L4    [explanation]

This is 1 of 2062 approved meteorites (plus 5 unapproved names) classified as L4.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 20 Dec 2021
Writeuphelp
Writeup from MB 110:

Northeast Africa 031 (NEA 031)

Libya

Purchased: 2019 Dec

Classification: Ordinary chondrite (L4)

History: Purchased by Mbark Arjdal in December 2019 from a Libyan dealer.

Petrography: (A. Irving, UWS and J. Boesenberg, BrownU) Well-formed chondrules containing devitrified glass are set in a matrix containing troilite, altered kamacite, subcalcic augite, chromite and merrillite.

Geochemistry: Olivine (Fa23.9±0.4, range Fa23.5-24.5, N = 6), low-Ca pyroxene (Fs19.2±1.3Wo0.6±0.1, range Fs16.7-20.5Wo0.4-0.6, N = 6), subcalcic augite (Fs13.4Wo27.0).

Classification: Ordinary chondrite (L4).

Specimens: 23.6 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 2019 Dec
Mass (g):260
Pieces:1
Class:L4
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):23.9±0.4
Ferrosilite (mol%):19.2±1.3
Wollastonite (mol%):0.6±0.1
Classifier:A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):23.6
Type spec location:UWB
Main mass:M. Arjdal
Comments:Work name Arj H19; 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)
BrownU: Joseph Boesenberg Brown University Dept of Earth, Environmental and Planetary Sciences (DEEPS) 324 Brook Street Providence, RI 02912 , United States (institutional address; updated 4 Jan 2024)
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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