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Northeast Africa 028
Basic information Name: Northeast Africa 028
     This is an OFFICIAL meteorite name.
Abbreviation: NEA 028
Observed fall: No
Year found: 2020
Country: Libya
Mass:help 93 g
Recommended:  CO3    [explanation]

This is 1 of 616 approved meteorites (plus 1 unapproved name) classified as CO3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 6 Oct 2021
Writeup from MB 110:

Northeast Africa 028 (NEA 028)


Purchased: 2020 Jun

Classification: Carbonaceous chondrite (CO3)

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

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Well-formed, relatively small glass-bearing chondrules (apparent diameter 200±75 µm, N = 22), zoned olivine and pyroxene fragments, and very fine grained CAI are set in a fine grained matrix (~30 vol.%, deep red-brown in thin section) containing troilite, kamacite and taenite. Pleonaste is present in some chondrules. Mineral phases in CAI include amoeboid hercynite, perovskite and Al-Ti-diopside.

Geochemistry: Olivine (Fa22.3±24.0, range Fa0.6-55.6, N = 5; Cr2O3 in ferroan olivine 0.04-0.10 wt.%, mean 0.07±0.02 wt.%, N = 6), low-Ca pyroxene (Fs2.6±1.5Wo0.9±0.2, range Fs1.3-4.2Wo0.7-1.1, N = 3), subcalcic augite (Fs6.2Wo34.9), Al-Ti-diopsde (Fs0.6Wo41.1, Al2O3 7.3 wt.%, TiO2 1.2 wt.%).

Classification: Carbonaceous chondrite (CO3).

Specimens: 21.9 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 2020 Jun
Mass (g):93
Shock stage:S2
Weathering grade:low
Fayalite (mol%):22.3±24.0
Ferrosilite (mol%):2.6±1.5
Wollastonite (mol%):0.9±0.2
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):21.9
Type spec location:UWB
Main mass:M. Arjdal
Comments:Work name Arj ZM 760; 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 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 1534 approved meteorites from Libya (plus 23 unapproved names) (plus 2 impact craters)

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