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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
Meteoritical Bulletin:  MB 110  (2022)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 666 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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
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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     This is 1 of 1562 approved meteorites from Libya (plus 25 unapproved names) (plus 2 impact craters)

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