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Northeast Africa 054
Basic information Name: Northeast Africa 054
     This is an OFFICIAL meteorite name.
Abbreviation: NEA 054
Observed fall: No
Year found: 2023
Country: Libya
Mass:help 214 g
Classification
  history:
Recommended:  Eucrite-br    [explanation]

This is 1 of 243 approved meteorites classified as Eucrite-br.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 25 Mar 2024
Writeuphelp
Writeup from MB 113:

Northeast Africa 054 (NEA 054)

Libya

Purchased: 2023 Jun

Classification: HED achondrite (Eucrite, brecciated)

History: Found in Libya and purchased in June 2023 by Fabien Kuntz from a dealer in Tindouf, Algeria.

Petrography: (A. Irving, UWS, and J. Boesenberg, BrownU) Complex moderately-shocked breccia composed of some lithic basaltic clasts (with fine subophitic and more coarse-grained intergranular textures) accompanied by abundant related crystalline debris in a finer grained matrix. Mineral phases are exsolved pigeonite, zoned unexsolved pigeonite, augite, calcic plagioclase (polycrystalline), silica polymorph, chromite, ilmenite, troilite, merrillite and Fe metal, plus minor secondary calcite and barite.

Geochemistry: Low-Ca pyroxene hosts (Fs59.8-65.5Wo5.6-2.2, FeO/MnO = 31-34, N = 6; Fs48.8-54.4Wo5.4-2.4, FeO/MnO = 33-36, N = 3), pigeonite hosts (Fs44.1-54.6Wo6.9-16.9, FeO/MnO = 31-36, N = 4), augite exsolution lamellae (Fs39.1-47.2Wo33.6-23.7, FeO/MnO = 31-34, N =5; Wo31.9-34.5Wo42.1-39.3, FeO/MnO = 33-35, N = 4), plagioclase (An74.2-75.0Or3.0-0.8, N = 2; An81.1-89.9Or1.4-0.2, N = 5), anorthite (An92.9Or0.2).

Classification: Eucrite (breccia). No diogenite component is present.

Specimens: 26.8 g including one polished thin section at UWB; remainder with Mr. F. Kuntz.

Data from:
  MB113
  Table 0
  Line 0:
Place of purchase:Tindouf
Date:P 2023 Jun
Mass (g):213.7
Pieces:1
Class:Eucrite-br
Shock stage:moderate
Weathering grade:low
Ferrosilite (mol%):59.8-65.5; 44.1-54.6; 39.1-47.2; 31.9-34.5
Wollastonite (mol%):5.6-2.2; 6.9-16.9; 33.6-23.7; 42.1-39.3
Classifier:A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):26.8
Type spec location:UWB
Main mass:F. Kuntz
Comments:Work name K577; 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)
Kuntz: Fabien Kuntz, France; Website (private address)
BrownU: Brown University Dept of Earth, Environmental and Planetary Sciences (DEEPS) 324 Brook Street Providence, RI 02912 , United States (institutional address; updated 21 Jul 2024)
Catalogs:
References: Published in Meteoritical Bulletin, no. 113, in preparation (2024)
Find references in NASA ADS:
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Geography:

Libya
Coordinates:Unknown.

Statistics:
     This is 1 of 1569 approved meteorites from Libya (plus 25 unapproved names) (plus 2 impact craters)

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