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Northwest Africa 13349
Basic information Name: Northwest Africa 13349
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13349
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 2.1 kg
Classification
  history:
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 238 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 7 Jul 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13349 (NWA 13349)

(Northwest Africa)

Purchased: 2019 Jul

Classification: HED achondrite (Eucrite, monomict)

History: Purchased by Habib Naji in July 2019 from a dealer in Zouerat, Mauritania.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Monomict breccia composed of highly shocked gabbroic eucrite clasts and related crystalline debris set within a sparse fluidal, melt-textured matrix. Minerals are unexsolved pigeonite and anorthite together with accessory silica polymorph, Ti-chromite (with quite variable Ti and Al) and troilite (as fine inclusions within chromite). Pigeonite grains consist of myriad very small subgrains zoned from more magnesian cores to more ferroan rims. Plagioclase is birefringent but exhibits a variety of textures from undulose to polycrystalline to finely quenched.

Geochemistry: Pigeonite (Fs40.1-45.2Wo4.0-11.5, FeO/MnO = 29-32, N = 3; Fs33.4Wo21.4, FeO/MnO = 29), ferroan low-Ca pyroxene (Fs56.3-57.5Wo3.9-4.9, FeO/MnO = 32-34, N = 2), augite (Fs17.0Wo45.2, FeO/MnO = 24), anorthite (An91.4-92.3Or0.2-0.3, N = 2).

Classification: Eucrite (monomict breccia, gabbroic, highly shocked and partially melted). The prevalence of compositionally zoned, unexsolved and highly recrystallized pyroxenes in this specimen is an anomalous feature.

Specimens: 36.8 g including one polished thin section at UWB; remainder with Mr. H. Naji.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Zouerat, Mauritania
Date:P 2019 Jul
Mass (g):2097
Pieces:1
Class:Eucrite-mmict
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):40.1-45.2; 56.3-57.5; 17.2
Wollastonite (mol%):4.0-11.5; 4.9-3.9; 45.2
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):36.8
Type spec location:UWB
Main mass:H. Naji
Comments:Work name HN-416; 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 7385 approved meteorites from (Northwest Africa) (plus 1955 unapproved names)

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