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Northwest Africa 13478
Basic information Name: Northwest Africa 13478
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13478
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 59 g
Classification
  history:
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 214 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 11 Nov 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13478 (NWA 13478)

(Northwest Africa)

Purchased: 2020 Sep

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased by Mark Lyon in September 2020 from a Mauritanian dealer.

Physical characteristics: The specimen exhibits whitish to beige, angular mineral clasts set within a dark brown matrix.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia composed of mineral clasts of anorthite, olivine, pigeonite (with ferropigeonite rims) and exsolved pigeonite set in a dark matrix containing kamacite, taenite, troilite, ilmenite, silica polymorph and fayalite, plus minor secondary barite and calcite.

Geochemistry: Olivine (Fa23.1-43.4, FeO/MnO = 86-117, N = 6), pigeonite (Fs19.1-21.1Wo7.1-11.5; Fs33.5Wo18.7; FeO/MnO = 47-56, N = 3),ferropigeonite rims (Fs60.8-75.7Wo20.1-23.5, FeO/MnO = 67-70, N = 2), low-Ca pyroxene host (Fs46.3Wo3.5, FeO/MnO = 63), augite exsolution lamella (Fs20.1Wo43.8, FeO/MnO = 51), augite host (Fs24.6Wo40.4, FeO/MnO = 63), low-Ca pyroxene exsolution lamella (Fs51.8Wo4.5, FeO/MnO = 74), fayalite (Fa97.1, FeO/MnO = 81), anorthite (An95.4-97.5Or0.1-0.3, N = 4).

Classification: Lunar (feldspathic breccia).

Specimens: 13.5 g including one polished slice at UWB; remainder with Mr. M. Lyon.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2020 Sep
Mass (g):59
Pieces:1
Class:Lunar (feldsp. breccia)
Shock stage:low
Weathering grade:low
Fayalite (mol%):23.1-43.4; 97.1
Ferrosilite (mol%):19.1-21.1; 60.8-75.7; 46.3-51.8; 20.1-24.6
Wollastonite (mol%):7.1-11.5; 20.1-23.5; 3.5-4.5; 40.4-43.8
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):13.5
Type spec location:UWB
Main mass:M. Lyon
Comments:Lyon20-5; 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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7552 approved meteorites from (Northwest Africa) (plus 1969 unapproved names)

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