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Northeast Africa 027
Basic information Name: Northeast Africa 027
     This is an OFFICIAL meteorite name.
Abbreviation: NEA 027
Observed fall: No
Year found: 2019
Country: Libya
Mass:help 497 g
Recommended:  Ureilite    [explanation]

This is 1 of 605 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 17 Oct 2021
Writeup from MB 110:

Northeast Africa 027 (NEA 027)


Purchased: 2019 Dec

Classification: Ureilite

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

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Composed of very finely recrystallized (mosaicized) olivine and clinopyroxene (accompanied by rare larger grains) together with accessory graphite, suessite, Si-bearing kamacite, Fe metal (with trace P), troilite, Cr-bearing troilite and pentlandite. Alteration of primary metal to iron hydroxides is pervasive.

Geochemistry: Olivine has reduced magnesian rims (despite the mosaicism). Olivine cores (Fa12.3-20.2, N = 4, olivine rims (Fa4.1-10.5, N = 5). Olivine contains 0.46 - 0.90 wt.% Cr2O3 and 0.20 - 0.34 wt.% CaO. Pigeonite (Fs8.1-13.5Wo8.3-6.5, N = 2), subcalcic augite (Fs4.4-9.9Wo30.3-31.8, N = 2), kamacite (Ni 3.4%, Si 3.8%).

Classification: Ureilite (shock recrystallized). Interesting features include the very high degree of mosaic recrystallization of mafic silicates plus the presence of accessory suessite and Si-bearing kamacite.

Specimens: 31.7 g plus one polished thin section at UWB; remainder with Mr. M. Arjdal.

Data from:
  Table 0
  Line 0:
Place of purchase:Libya
Date:P 2019 Dec
Mass (g):497
Shock stage:high
Weathering grade:high
Fayalite (mol%):4.1-20.2
Ferrosilite (mol%):8.1-13.5; 4.4-9.9
Wollastonite (mol%):6.5-8.3; 30.3-31.8
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):31.7
Type spec location:UWB
Main mass:M. Arjdal
Comments:Work name Arj H16; 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. 110, in preparation (2021)
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     This is 1 of 1529 approved meteorites from Libya (plus 23 unapproved names) (plus 2 impact craters)

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