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Northwest Africa 13923
Basic information Name: Northwest Africa 13923
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13923
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 720 g
Classification
  history:
Recommended:  Ureilite-pmict    [explanation]

This is 1 of 29 approved meteorites classified as Ureilite-pmict.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 29 May 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13923 (NWA 13923)

(Northwest Africa)

Purchased: 2018

Classification: Ureilite (polymict)

History: Purchased by Ziyao Wang in 2018 from a dealer in Erfoud, Morocco.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia consisting predominantly of clasts of ureilite in a matrix of related debris, but also including an unusual feldspathic mafic clast. The typical ureilite component consists of olivine (with reduced magnesian rims containing fine grained altered Fe metal) plus pigeonite with accessory graphite. The mafic clast in the studied thin section consists of ilmenite (Mg-Cr-Mn bearing), troilite, chlorapatite, pigeonite, sodic plagioclase and Fe-bearing feldspathic glass.

Geochemistry: Olivine (cores Fa21.8-23.4, N = 4; rims Fa2.6-8.2, N = 5), pigeonite (Fs16.3-19.2Wo6.8-9.6, N = 2), pigeonite rim on olivine (Fs5.3Wo6.9),

Classification: Ureilite (polymict breccia). The unusual feldspathic mafic clast in this specimen has similarities to those described by Goodrich and Keil (2002) in Dar al Gani 165.

Specimens: 30.2 g including one polished thin section at UWB; remainder with WangZ.

Bibliography:
  • Goodrich C.A. and Keil K. (2002) Feldspathic and other unusual clasts in polymict ureilite DaG 165. Lunar Planet. Sci. Conf. 33, abstract no. 1777 (link)
Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2018
Mass (g):720
Pieces:1
Class:Ureilite-pmict
Shock stage:moderate
Weathering grade:low
Fayalite (mol%):21.8-23.4
Ferrosilite (mol%):16.3-19.2; 1.2
Wollastonite (mol%):6.8-9.6; 0.3
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):30.2
Type spec location:UWB
Main mass:WangZ
Comments:Work name WZY-08; 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, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
LPI: Lunar and Planetary Institute, 3600 Bay Area Blvd., Houston, TX 77058 , United States (institutional address; updated 10 Jul 2010)
WangZ: Ziyao Wang, Hebei GEO University North Campus, Huai An dong road 127, Shijiazhuang, Hebei Province , China (private address; updated 25 Jun 2021)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Ziyao Wang            
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8025 approved meteorites from (Northwest Africa) (plus 1951 unapproved names)

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