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Northwest Africa 13325
Basic information Name: Northwest Africa 13325
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13325
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 7.84 kg
Recommended:  Eucrite-br    [explanation]

This is 1 of 217 approved meteorites classified as Eucrite-br.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 3 Jul 2020
Writeup from MB 109:

Northwest Africa 13325 (NWA 13325)

(Northwest Africa)

Purchased: 2019 Nov

Classification: HED achondrite (Eucrite, brecciated)

History: Purchased by Mark Lyon in November 2019 from a Moroccan dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia composed of texturally diverse eucrite clasts (up to 2.8 cm across) exhibiting gabbroic, diabasic, granulitic and partially recrystallized textures set within a fragmental matrix of related crystalline debris. Major minerals are low-Ca pyroxene, augite and calcic plagioclase, together with accessory silica polymorph, Ti-Al-bearing chromite, ilmenite, troilite and Ni-free iron metal. In coarser grained gabbroic and diabasic clasts low-Ca and high-Ca pyroxenes are in exsolution relationship and represent former pigeonite, but in granulitic and recrystallized clasts both pyroxenes are present as discrete grains. In partially recrystallized clasts pyroxene is finely polygranular but plagioclase is not.

Geochemistry: Low-Ca pyroxene (Fs56.8-58.3Wo4.8-7.0, FeO/MnO = 29-31, N = 5), augite (Fs28.9-30.2Wo40.1-41.0, FeO/MnO = 31-34, N = 5), plagioclase (An88.4-90.0Or0.8-0.5, N = 5).

Classification: Eucrite (genomict breccia).

Specimens: 212 g including one large polished thin section at UWB; remainder with Mr. M. Lyon.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2019 Nov
Mass (g):7842
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):56.8-58.3; 28.9-30.2
Wollastonite (mol%):4.8-7.0; 40.1-41.0
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):212
Type spec location:UWB
Main mass:M. Lyon
Comments:Work name Lyon20-1; submitted by A. Irving
   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)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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     This is 1 of 8745 approved meteorites from (Northwest Africa) (plus 1880 unapproved names)

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