header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 13 Jul 2024
Search for: Search type: Search limits: Display: Publication:
Names
Text help
Places
Classes
Years
Contains
Starts with
Exact
Sounds like
NonAntarctic
Falls  Non-NWAs
What's new
  in the last:
Limit to approved meteorite names
Search text:  
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
Classification
  history:
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
Writeuphelp
Writeup from MB 110:

Northeast Africa 027 (NEA 027)

Libya

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:
  MB110
  Table 0
  Line 0:
Place of purchase:Libya
Date:P 2019 Dec
Mass (g):497
Pieces:1
Class:Ureilite
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
Institutions
   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)
Catalogs:
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
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Libya
Coordinates:Unknown.

Statistics:
     This is 1 of 1562 approved meteorites from Libya (plus 25 unapproved names) (plus 2 impact craters)

Direct link to this page