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Northwest Africa 13206
Basic information Name: Northwest Africa 13206
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13206
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 414 g
Recommended:  Howardite    [explanation]

This is 1 of 421 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 29 Feb 2020
Writeup from MB 109:

Northwest Africa 13206 (NWA 13206)

(Northwest Africa)

Purchased: 2019 Dec

Classification: HED achondrite (Howardite)

History: Purchased by Terry Boudreaux in December 2019 from a dealer in Zagora, Morocco.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia composed of sparse lithic eucrite clasts (with microgabbroic, subophitic and granulitic textures), related mineral debris and abundant diogenitic orthopyroxene clasts (overall ~65 vol.%, exhibiting undulose extinction) within a finer grained matrix. Other minerals are exsolved pigeonite, calcic plagioclase, olivine, unexsolved pigeonite, silica polymorph, fayalite, chromite, ilmenite, troilite and Ni-poor metal.

Geochemistry: Diogenitic orthopyroxene (Fs23.6-26.5Wo1.8-2.7, FeO/MnO = 27-30, N = 3), olivine (Fa24.0, FeO/MnO = 43), low-Ca pyroxene host (Fs58.4-62.0Wo6.8-4.9, FeO/MnO = 30-34, N = 3), clinopyroxene exsolution lamellae (Fs30.5-31.4Wo39.5-40.6, FeO/MnO = 32-34, N = 2), pigeonite (Fs31.6-34.2Wo4.8-7.5, FeO/MnO = 28-29, N =3), fayalite (Fa75.8, FeO/MnO = 47), plagioclase (An89.8-93.7Or0.4-0.2, N = 4).

Classification: Howardite.

Specimens: 20.4 g including one polished thin section at UWB; remainder with Mr. T. Boudreaux.

Data from:
  Table 0
  Line 0:
Place of purchase:Zagora
Date:P 2019 Dec
Mass (g):414
Shock stage:low
Weathering grade:low
Fayalite (mol%):24.0; 75.9
Ferrosilite (mol%):23.9-26.5; 58.4-62.0; 30.5-31.4
Wollastonite (mol%):1.8-2.7; 6.8-4.9; 39.5-40.6
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):20.4
Type spec location:UWB
Main mass:T. Boudreaux
Comments:Work name TBx19-1; 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)
Boudreaux: Terry Boudreaux, Illinois, United States (private address)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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     This is 1 of 8559 approved meteorites from (Northwest Africa) (plus 1896 unapproved names)

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