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Northeast Africa 011
Basic information Name: Northeast Africa 011
     This is an OFFICIAL meteorite name.
Abbreviation: NEA 011
Observed fall: No
Year found: 2020
Country: Libya
Mass:help 161.2 g
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 288 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 27 Jun 2020
Writeup from MB 109:

Northeast Africa 011 (NEA 011)


Purchased: 2020 Jan

Classification: Martian meteorite (Shergottite)

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

Physical characteristics: Two nearly identical regmaglypted stones (total weight 161.2 g) completely coated by black fusion crust. The fresh interiors are overall gray in color, and exhibit elongate, light-gray pyroxene grains, glassy maskelynite and sparse black, glassy shock pockets.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) This aphyric specimen is notable for the large differences in grainsize among the constituent minerals. The major components are zoned clinopyroxene (as elongate prismatic grains up to 1.8 mm long) interspersed with thin lath-like maskelynite grains (up to 0.5 mm long), together with much finer grained accessory merrillite, ilmenite, titanomagnetite, pyrrhotite and interstitial K-rich alkali feldspar.

Geochemistry: Pigeonite (Fs28.4-31.8Wo10.4-12.1, FeO/MnO = 28, N = 2), subcalcic augite (Fs21.7-25.5Wo35.3-28.7, FeO/MnO = 27-30, N = 2), ferroan pigeonite rims (Fs53.5-69.1Wo22.3-14.3, FeO/MnO = 37-42, N = 4), maskelynite (An44.0-47.0Or1.9-3.2, N = 3), alkali feldspar (Or68.5Ab26.4An5.2).

Classification: Shergottite (aphyric).

Specimens: 21.1 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 Jan
Mass (g):161.2
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):28.4-31.8; 21.7-25.5; 53.5-69.1
Wollastonite (mol%):10.4-12.1; 35.3-28.7; 22.3-14.3
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):21.1
Type spec location:UWB
Main mass:M. Arjdal
Comments:Work name Arj A1; 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 Meteoritical Bulletin, no. 109, in preparation (2020)
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     This is 1 of 1537 approved meteorites from Libya (plus 23 unapproved names) (plus 2 impact craters)

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