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Northeast Africa 053
Basic information Name: Northeast Africa 053
     This is an OFFICIAL meteorite name.
Abbreviation: NEA 053
Observed fall: No
Year found: 2023
Country: Libya
Mass:help 2 kg
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 322 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 20 Feb 2024
Revised 26 Feb 2024: renamed from NWA 16399
Writeup from MB 113:

Northeast Africa 053 (NEA 053)

(Northwest Africa)

Purchased: 2023

Classification: Martian meteorite (Shergottite)

History: Reportedly this stone was found in Libya.

Petrography: (K. Metzler, IfP) Igneous rock, dominated by elongated pyroxene grains (low-Ca and Ca-rich pyroxene) up to 3 mm and isometric olivine grains up to 2.5 mm, with an interstitial mixture of lathy skeletal plagioclase and pyroxene grains. Olivine and pyroxene crystals show igneous chemical zoning. Point counting on thin section images revealed 33 vol% olivine, 40 vol% pyroxene, and 27 vol% plagioclase. The latter has been completely transformed to maskelynite. Accessories are an SiO2 polymorph, ilmenite and titanomagnetite.

Geochemistry: Mineral compositions and geochemistry: Mean mineral compositions: Olivine Fa46.0±12.9 (Fa28.5-62.9); Fe/Mn (at.): 52.9; n=11. Low-Ca pyroxene Fs31.4±9.5 Wo7.2±2.8 (Fs25.4-47.6Wo4.7-12.6); Fe/Mn (at.): 29.9; n=12. Ca-rich pyroxene Fs23.0±1.4Wo30.5±3.7 (Fs21.5-25.9Wo26.0-37.2); Fe/Mn (at.): 32.4; n=14. Plagioclase (maskelynite) An46.3±2.3Or2.4±0.5 (An43.0-49.8Or1.7-3.1); n=12. Fusion crust composition (wt%): Na2O: 1.3; MgO: 14.5; Al2O3: 6.2; SiO2:48.1; P2O5: 0.8; K2O: 0.1; CaO: 7.4; TiO2: 0.8; Cr2O3: 0.4; MnO: 0.5; FeO: 19.7

Classification: Martian (Shergottite, olivine-bearing), based on texture and mineral chemistry.

Data from:
  Table 0
  Line 0:
Place of purchase:Libya
Date:P 2023
Mass (g):2000
Class:Martian (shergottite)
Shock stage:M-S4
Weathering grade:low
Fayalite (mol%):46.0±12.9
Ferrosilite (mol%):31.4±9.5; 23.0±1.4
Wollastonite (mol%):7.2±2.8; 30.5±3.7
Classifier:K. Metzler, IfP
Type spec mass (g):20
Type spec location:IfP
Main mass:Said Muftah Bachir, Western Sahara
Comments:Submitted by K. Metzler, IfP
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
References: Published in Meteoritical Bulletin, no. 113, in preparation (2024)
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Public domain photographs:
Knut Metzler      


     This is 1 of 1557 approved meteorites from Libya (plus 24 unapproved names) (plus 2 impact craters)
Synonymshelp: Northwest Africa 16399 (Originally misnamed as an NWA)
NWA 16399 (Originally misnamed as an NWA)

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