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Northwest Africa 8638
Basic information Name: Northwest Africa 8638
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8638
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 2.13 kg
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 660 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 25 Nov 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 8638 (NWA 8638)

(Northwest Africa)

Purchased: 2014 Apr

Classification: Ureilite

History: Purchased in Temara, Morocco, by Adam Aaronson in April 2014.

Physical characteristics: Extremely hard, black specimen (2130 g).

Petrography: (A. Irving and S. Kuehner, UWS) Protogranular aggregate of olivine with relatively thick, dark reduced rims and pigeonite with minor orthopyroxene.

Geochemistry: Olivine (cores Fa25.0-25.1, Cr2O3 = 0.6 wt.%; rim Fa 5.5, N = 3), pigeonite (Fs19.8Wo11.0), orthopyroxene (Fs15.5Wo4.9).

Classification: Ureilite

Specimens: 21 g including one polished thin section at UWB. The remainder is held by Aaronson.

Data from:
  MB103
  Table 0
  Line 0:
Place of purchase:Temara
Date:P 2014 Apr
Mass (g):2130
Pieces:1
Class:Ureilite
Shock stage:high
Weathering grade:low
Fayalite (mol%):25.0-25.1
Ferrosilite (mol%):19.8; 15.5
Wollastonite (mol%):11.0; 4.9
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):21
Type spec location:UWB
Main mass:A. Aaronson
Comments:M1725; 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)
UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)
Also see:
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Revision
  history:
  This lists important revisions made to data for this record.

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