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Northwest Africa 13480
Basic information Name: Northwest Africa 13480
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13480
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 1495 g
Classification
  history:
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 255 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 11 Nov 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13480 (NWA 13480)

(Northwest Africa)

Purchased: 2020 Sep

Classification: HED achondrite (Eucrite, monomict)

History: Purchased by Terry Boudreaux in September 2020 from a dealer in Zagora, Morocco.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Very fresh specimen composed of gabbroic eucrite clasts with subophitic textures set within a finer grained, metamorphic-textured recrystallized matrix. The major phases are exsolved pigeonite and anorthite accompanied by accessory ilmenite (some associated with small grains of zircon), Ti-chromite, low-Ti chromite and minor olivine (as inclusions in low-Ca pyroxene). The host phase in exsolved pyroxene grains is pigeonite rather than orthopyroxene and exsolution lamellae are subcalcic augite.

Geochemistry: Pigeonite (Fs48.4-51.5Wo5.1-7.3, FeO/MnO = 33-35, N = 6), subcalcic augite Fs26.1-29.7Wo32.9-39.8, FeO/MnO = 30-33, N = 4), olivine (Fa62.6-63.3, FeO/MnO = 53-54, N = 2), anorthite (An91.6-92.3Or0.2-0.3, N = 4).

Classification: Eucrite (monomict gabbroic breccia, recrystallized).

Specimens: 37.1 g including one polished thin section at UWB; remainder with Mr. T. Boudreaux.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Zagora
Date:P 2020 Sep
Mass (g):1495
Pieces:2
Class:Eucrite-mmict
Shock stage:low
Weathering grade:low
Fayalite (mol%):62.6-63.3
Ferrosilite (mol%):48.4-51.5; 26.1-29.7
Wollastonite (mol%):5.1-7.3; 32.9-39.8
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):37.1
Type spec location:UWB
Main mass:T. Boudreaux
Comments:RC136.3; 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)
Boudreaux: Terry Boudreaux, Illinois, United States (private address)
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 7937 approved meteorites from (Northwest Africa) (plus 1960 unapproved names)

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