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Northwest Africa 11257
Basic information Name: Northwest Africa 11257
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11257
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 330 g
Classification
  history:
Meteoritical Bulletin:  MB 106  (2018)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 660 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 9 Jun 2017
Writeuphelp
Writeup from MB 106:

Northwest Africa 11257 (NWA 11257)

(Northwest Africa)

Purchased: 2017 Feb

Classification: Ureilite

History: Purchased by Ben Hoefnagels in February 2017 from a dealer in Ouarzazate, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Protogranular aggregate of ~70 vol.% olivine and ~30 vol.% pigeonite. Olivine grains have reduced magnesian rims containing blebs of Fe metal.

Geochemistry: Olivine (cores Fa22.3-22.4, rim Fa9.1, N = 3), pigeonite (Fs13.1Wo9.6; Fs17.2Wo14.1; Fs5.7Wo21.1; N = 3).

Classification: Ureilite.

Specimens: 23 g including one polished thin section at UWB; remainder with Mr. B. Hoefnagels.

Data from:
  MB106
  Table 0
  Line 0:
Place of purchase:Ouarzazate
Date:P 2017 Feb
Mass (g):330
Pieces:1
Class:Ureilite
Shock stage:low
Weathering grade:low
Fayalite (mol%):22.3-22.4
Ferrosilite (mol%):13.1; 17.2; 5.7
Wollastonite (mol%):9.6; 14.1; 21.1
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):23
Type spec location:UWB
Main mass:B. Hoefnagels
Comments:Work name BH053; 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)
Catalogs:
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)
Also see:
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Revision
  history:
  This lists important revisions made to data for this record.

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