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Northwest Africa 15829
Basic information Name: Northwest Africa 15829
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15829
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 1170 g
Recommended:  Diogenite-pm    [explanation]

This is 1 of 59 approved meteorites classified as Diogenite-pm.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 7 May 2023
Writeup from MB 112:

Northwest Africa 15829 (NWA 15829)

(Northwest Africa)

Purchased: 2022 Nov

Classification: HED achondrite (Diogenite, polymict)

History: Purportedly found near Mijek, southern Morocco and purchased by Jason Phillips and James Tobin in November 2022 from a Mauritanian dealer.

Petrography: (A. Irving, UWS, and P. Carpenter, WUSL) Breccia composed almost entirely of angular mineral clasts of diogenitic orthopyroxene together with rare lithic eucrite clasts (with variolitic or microgabbroic textures) and some mineral clasts of exsolved pigeonite and calcic plagioclase within a fine grained matrix of related debris (including silica polymorph, troilite, ilmenite and rare baddeleyite). Also present in the studied thin section is a large (1.5 cm) noritic diogenite clast composed of ~50 vol.% each of orthopyroxene and anorthite (as polycrystalline clusters) with minor chromite (translucent brown in thin section).

Geochemistry: Diogenitic orthopyroxene (Fs26.3-31.0Wo3.0-4.9, FeO/MnO = 24-32, N = 4), pigeonite (Fs49.6-69.1Wo6.1-9.4, FeO/MnO = 31-32, N = 3; Fs63.3Wo17.3, FeO/MnO = 35), subcalcic augite (Fs64.5Wo22.3, FeO/MnO = 38), augite exsolution lamellae (Fs24.6-30.8Wo41.2-40.1, FeO/MnO = 32, N = 2), ferroan olivine (Fa64.8-73.7, FeO/MnO = 43-46, N = 3), olivine inclusion in orthopyroxene (Fa37.3, FeO/MnO = 54), calcic plagioclase (An82.1-88.0Or0.9-0.4; An70.2Or2.0; N = 3), anorthite (An96.8Or0.1).

Classification: Diogenite (polymict breccia).

Specimens: 23.2 g including one polished thin section at UWB; remainder held jointly by Mr. J. Phillips and Mr. J. Tobin.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2022 Nov
Mass (g):1170
Shock stage:low
Weathering grade:low
Fayalite (mol%):64.8-73.7
Ferrosilite (mol%):26.3-31.0; 49.6-69.1; 24.6-30.8
Wollastonite (mol%):3.0-4.9; 6.1-17.3; 41.2-40.1
Classifier:A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):23.2
Type spec location:UWB
Main mass:J. Phillips/J. Tobin
Comments:Work name JP22-2; 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)
Tobin: J. Tobin, The Meteorite Exchange, PMB #455, P.O. Box 7000, Redondo Beach, CA 90277, United States (private address)
BrownU: Brown University Providence, RI 02912, United States (institutional address; updated 7 Sep 2019)
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
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     This is 1 of 9092 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)

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