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Northwest Africa 12250
Basic information Name: Northwest Africa 12250
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12250
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 42.7 g
Meteoritical Bulletin:  MB 107  (2018)  Howardite
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 24 Nov 2018
Writeup from MB 107:

Northwest Africa 12250 (NWA 12250)

(Northwest Africa)

Purchased: 2018 May

Classification: HED achondrite (Howardite)

History: Found in Algeria and purchased by Darryl Pitt in May 2018 from a Mauritanian dealer.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed mainly of mineral clasts derived from gabbroic eucrites, rare lithic clasts of gabbroic eucrite, and ~15 vol.% diogenitic orthopyroxene (~15 vol.%) in a finer grained matrix of related debris. Other minerals are olivine, exsolved pigeonite, unexsolved pigeonite, subcalcic augite, calcic plagioclase, ilmenite and troilite.

Geochemistry: Diogenitic orthopyroxene (Fs16.0-18.3Wo1.3-1.5, FeO/MnO = 29-31, N = 2), olivine (Fa52.0-57.1, FeO/MnO = 47-50, N = 2), orthopyroxene host in exsolved pigeonite (Fs54.3Wo1.1; Fs61.7Wo1.4; FeO/MnO = 28-29; N = 2), pigeonite (Fs58.0Wo15.1, FeO/MnO = 34), subcalcic augite (Fs55.6Wo24.6 FeO/MnO = 30), plagioclase (An82.0-89.4Or0.9-0.3, N = 2).

Classification: Howardite.

Specimens: 12.2 g including one polished thin section at UWB; remainder with DPitt.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2018 May
Mass (g):42.7
Shock stage:low
Weathering grade:low
Fayalite (mol%):52.0-57.1
Ferrosilite (mol%):16.0-18.3; 54.3
Wollastonite (mol%):1.3-1.5; 1.1
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):12.2
Type spec location:UWB
Main mass:DPitt
Comments:Work name MVCH 375; 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)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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     This is 1 of 8559 approved meteorites from (Northwest Africa) (plus 1896 unapproved names)

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