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Northwest Africa 13929
Basic information Name: Northwest Africa 13929
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13929
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 1184 g
Classification
  history:
Meteoritical Bulletin:  MB 110  (2022)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 409 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 25 Apr 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13929 (NWA 13929)

(Northwest Africa)

Purchased: 2021 Mar

Classification: HED achondrite (Eucrite, polymict)

History: Purchased by Rachid Chaoui from a Mauritanian dealer and subsequently acquired by Didi Baidari in March 2021.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia composed predominantly of lithic eucrite clasts and related mineral debris plus <10 vol.% diogenitic material (including some noritic diogenite lithic clasts) in a finer grained matrix. Minerals include exsolved pigeonite, calcic plagioclase and low-Ca diogenitic pyroxene together with accessory silica, troilite, ilmenite, olivine, fayalite and low-Ti chromite.

Geochemistry: Low-Ca pyroxene host (Fs53.3-59.3Wo3.3-4.9, FeO/MnO = 32, N = 2), augite exsolution lamellae (Fs23.3-28.7Wo36.0-41.1, FeO/MnO = 29-30, N = 2), low-Ca pyroxene in noritic diogenite clast (cores Fs33.4-33.7Wo3.6-5.2, FeO/MnO = 26-32, N = 2; rim Fs50.2Wo2.8, FeO/MnO = 32), augite in nortitic diogenite clast (Fs16.2Wo41.3, FeO/MnO = 20), olivine (Fa57.9, FeO/MnO = 51), fayalite (Fa80.8, FeO/MnO = 42), calcic plagioclase (An88.8-94.0Or2.8-0.2, N = 3), anorthite in noritic diogenite clast (An95.0Or0.2).

Classification: Eucrite (polymict breccia).

Specimens: 28.3 g including one polished thin section at UWB; remainder with Mr. D. Baidari.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Zagora
Date:P 2021 Mar
Mass (g):1184
Pieces:1
Class:Eucrite-pmict
Shock stage:low
Weathering grade:low
Fayalite (mol%):57.9; 80.8
Ferrosilite (mol%):33.4-33.7; 16.2; 53.3-59.3; 23.3-28.7
Wollastonite (mol%):3.6-5.2; 41.3; 3.3-4.9; 36.0-41.1
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):28.3
Type spec location:UWB
Main mass:D. Baidari
Comments:Work name RC144.2; 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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
Catalogs:
References: Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)
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